US20200016385A1 - Dilator - Google Patents
Dilator Download PDFInfo
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- US20200016385A1 US20200016385A1 US16/579,946 US201916579946A US2020016385A1 US 20200016385 A1 US20200016385 A1 US 20200016385A1 US 201916579946 A US201916579946 A US 201916579946A US 2020016385 A1 US2020016385 A1 US 2020016385A1
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- United States
- Prior art keywords
- shaft
- coil body
- distal end
- dilator
- wires
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-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/34—Trocars; Puncturing needles
- A61B17/3417—Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M29/00—Dilators with or without means for introducing media, e.g. remedies
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/02—Devices for expanding tissue, e.g. skin tissue
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0021—Catheters; Hollow probes characterised by the form of the tubing
- A61M25/0023—Catheters; Hollow probes characterised by the form of the tubing by the form of the lumen, e.g. cross-section, variable diameter
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M25/005—Catheters; Hollow probes characterised by structural features with embedded materials for reinforcement, e.g. wires, coils, braids
- A61M25/0052—Localized reinforcement, e.g. where only a specific part of the catheter is reinforced, for rapid exchange guidewire port
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M25/005—Catheters; Hollow probes characterised by structural features with embedded materials for reinforcement, e.g. wires, coils, braids
- A61M25/0053—Catheters; Hollow probes characterised by structural features with embedded materials for reinforcement, e.g. wires, coils, braids having a variable stiffness along the longitudinal axis, e.g. by varying the pitch of the coil or braid
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0067—Catheters; Hollow probes characterised by the distal end, e.g. tips
- A61M25/008—Strength or flexibility characteristics of the catheter tip
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/06—Body-piercing guide needles or the like
- A61M25/0662—Guide tubes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00831—Material properties
- A61B2017/00902—Material properties transparent or translucent
- A61B2017/00915—Material properties transparent or translucent for radioactive radiation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/34—Trocars; Puncturing needles
- A61B17/3417—Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating
- A61B2017/3454—Details of tips
- A61B2017/3456—Details of tips blunt
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/34—Trocars; Puncturing needles
- A61B17/3417—Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating
- A61B2017/3454—Details of tips
- A61B2017/3458—Details of tips threaded
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/39—Markers, e.g. radio-opaque or breast lesions markers
- A61B2090/3966—Radiopaque markers visible in an X-ray image
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M2025/006—Catheters; Hollow probes characterised by structural features having a special surface topography or special surface properties, e.g. roughened or knurled surface
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/06—Body-piercing guide needles or the like
- A61M25/0662—Guide tubes
- A61M2025/0687—Guide tubes having means for atraumatic insertion in the body or protection of the tip of the sheath during insertion, e.g. special designs of dilators, needles or sheaths
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M25/005—Catheters; Hollow probes characterised by structural features with embedded materials for reinforcement, e.g. wires, coils, braids
Definitions
- the present disclosure relates to a dilator.
- an auxiliary tool called a sheath introducer is used when a catheter is inserted into a body lumen such as a patient's blood vessel.
- a sheath introducer includes a sheath for connecting a patient's body lumen to the outside of the body, and a dilator to be inserted into the sheath for expanding a hole formed on a body surface.
- Japanese Patent Application Laid-Open Publication No. 2008-11867 describes a sheath introducer 200 including a sheath 80 and a dilator 70 (see FIG. 1 and others).
- the above sheath introducer 200 is used as follows: the patient's skin is first perforated at a predetermined location using an introducer needle, a guide wire is inserted into a body lumen such as a blood vessel through the resulting hole, a proximal end of the guide wire is inserted into a distal end of the sheath introducer 200 where the dilator 70 is already inserted into the sheath 80 , and the sheath introducer 200 is then inserted into the body lumen along the guide wire. During this, a distal end of the dilator 70 will expand the diameter of the hole formed on the skin. Subsequently, the dilator 70 is withdrawn from the sheath introducer 200 , and then a catheter is inserted into the sheath introducer 200 and is inserted into a body lumen such as a blood vessel.
- Such a sheath introducer is usually designed to be inserted through the patient's skin, and is generally short and linear as described in Japanese Patent Application Laid-Open Publication No. 2008-11867.
- an alternative procedure is performed as follows: an introducer needle is pushed out of a distal end of an endoscope inserted through the patient's mouth or nose instead of through the patient's skin to perforate the wall of a digestive tract such as a patient's stomach at a predetermined location, a guide wire is inserted through the resulting hole, a proximal end of the guide wire is inserted into a distal end of a dilator, and the dilator is then inserted into the wall of the digestive tract along the guide wire to increase the diameter of the hole formed on the wall of the digestive tract.
- a dilator for use in such a procedure is designed to be inserted through the patient's mouth or nose, and thus needs to be relatively long and generally configured so as to be used in a curved state, considering that it is to be passed through the digestive tract.
- an increased length of a dilator may have a problem in that a rotational force (torque) and pushing force (pushability) from the user's hand cannot be transmitted to a distal end of the dilator, which in turn may preclude increasing the diameter of a hole formed on the wall of a digestive tract.
- a curved dilator further had a problem in that the deterioration of these properties becomes more significant.
- An object of the disclosed embodiments is to provide a dilator capable of easily increasing the diameter of a hole formed on the wall of a digestive tract and the like and also capable of maintaining pushability and torquability even when a shaft is longer and curved.
- a dilator including: a hollow shaft having an outer diameter that is smaller at a distal end of the shaft than at a proximal end of the shaft; and a grip portion connected to the proximal end of the shaft, a spirally-arranged protruding portion protruding outwardly being provided on an outer peripheral surface of the shaft, and the spirally-arranged protruding portion having gaps between adjacent protruding portions along a longitudinal axis of the shaft.
- FIG. 1 show an overall view of a dilator according to the disclosed embodiments
- FIG. 2 shows a distal end portion with a view of an inner cavity of the dilator (a multilayer body) shown in FIG. 1 ;
- FIG. 3 shows a cross-sectional view taken along line III-III in FIG. 1 ;
- FIG. 4 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments
- FIG. 5 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments
- FIG. 6 shows a distal end portion with a view of an inner cavity of the dilator (a multilayer body) shown in FIG. 5 ;
- FIG. 7 shows a cross-sectional view taken along line VII-VII in FIG. 5 ;
- FIG. 8 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments
- FIG. 9 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments.
- FIG. 10 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments
- FIG. 11 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments
- FIG. 12 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments
- FIG. 13 show an overall view of a dilator according to the disclosed embodiments
- FIG. 14 shows a partial cross-sectional view of a distal-end side portion of a dilator according to the disclosed embodiments
- FIG. 15 shows a partial cross-sectional view of a distal-end side portion of a dilator according to the disclosed embodiments
- FIG. 16 shows a partial cross-sectional view of a distal-end side portion of a dilator according to the disclosed embodiments
- FIG. 17 shows a distal end portion of a dilator according to the disclosed embodiments.
- FIG. 1 shows an overall view of a dilator according to the disclosed embodiments
- FIG. 2 shows a front end portion (distal end portion) with a view of an inner cavity of the dilator (a multilayer body)
- FIG. 3 shows a cross-sectional view taken along line III-Ill in FIG. 1 .
- the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon.
- a dilator 1 includes: a multilayer body 7 including a hollow coil body 3 including a plurality of element wires 3 a , 3 b , 3 c , 3 d , 3 e , 3 f , 3 g , 3 h , 3 j , and 3 k (e.g., metal wires) wound around into a hollow shape, and a coil body 5 including a single element wire 5 a (e.g., a metal wire) wound around a surface of the hollow coil body 3 in a direction (clockwise, facing to the distal end) opposite to the hollow coil body 3 (counterclockwise, facing to the distal end); and a connector 9 having a hollow shape connected to a proximal end of the multilayer body 7 .
- a connector 9 having a hollow shape connected to a proximal end of the multilayer body 7 .
- the multilayer body 7 has a cylindrical hollow shape at a proximal end portion P 3 , has a tapered hollow shape at an intermediate portion P 2 , and has a cylindrical hollow shape at a distal end portion P 1 .
- wires 3 a , 3 b , 3 c , 3 d , 3 e , 3 f , 3 g , 3 h , 3 j , and 3 k correspond to the “first wires”
- the hollow coil body 3 corresponds to the “first layer body,” the “shaft,” and the “first coil.”
- the wire 5 a corresponds to the “second wire”
- the coil body 5 corresponds to the “second layer body,” the “spirally-arranged protruding portion,” and the “second coil.”
- intermediate portion P 2 of the hollow coil body 3 corresponds to the “tapered hollow portion” and the “portion having an increasing outer diameter (tapered shape).” Further, the connector 9 corresponds to the “grip portion.”
- the hollow coil body 3 is configured such that the wires 3 a , 3 b , 3 c , 3 d , 3 e , 3 f , 3 g , 3 h , 3 j , and 3 k are 10 wires (e.g., stainless steel wires) wound around into a hollow shape as shown in FIG. 3 .
- the hollow coil body 3 has a cylindrical hollow shape at the proximal end portion P 3 , has a tapered hollow shape at the intermediate portion P 2 , has a cylindrical hollow shape at the distal end portion P 1 , and has an outer diameter increasing toward a proximal end (an increasing outer diameter). That is, the hollow coil body 3 has a hollow shape having an outer diameter that is smaller at the distal end than at the proximal end.
- the dotted lines represent the common inscribed lines of the hollow coil body 3 .
- An inner cavity 8 is formed in the inner side of the common inscribed lines of the hollow coil body 3 (see FIG. 3 ).
- wires made of stainless steel can be used as the wires of the hollow coil body 3 , they are not limited to stainless steel wires. They may be wires made of a superelastic alloy such as nickel-titanium. Further, they are not limited to metal wires and may be resin wires.
- the coil body 5 is configured such that a wire 5 a (e.g., a stainless steel wire) is wound around in a direction (clockwise, facing to the distal end) opposite to the hollow coil body 3 (counterclockwise, facing to the distal end).
- a wire 5 a e.g., a stainless steel wire
- the wire 5 a is wound around closely (with a small winding pitch, for example where adjacent windings of the wire 5 a are in contact with each other) at the proximal end side and is wound around with gaps between adjacent windings at the intermediate portion P 2 and the distal end portion P 1 .
- the coil body 5 provides a spirally-arranged protruding portion protruding outwardly (the outermost surface of the dilator 1 , the outermost portion) on an outer peripheral surface 3 L of the hollow coil body 3 .
- the spirally-arranged protruding portion extends in a spiral shape along its length, and has gaps between adjacent portions (adjacent windings of the wire 5 a ) along a longitudinal A of the hollow coil body 3 .
- the coil body 5 is provided at the intermediate portion P 2 , which corresponds to a portion having an increasing outer diameter of the hollow coil body 3 .
- the amount of gap (space) between adjacent windings of the wire 5 a is gradually decreased at the proximal end portion P 3 toward the proximal end side thereof.
- This configuration enables the stiffness of the dilator 1 (the multilayer body 7 ) to be gradually changed along an axis direction (a direction of the longitudinal axis) so that the dilator 1 (multilayer body 7 ) can easily enter into the inside of an approach pathway even when the approach pathway meanders.
- the wire 5 a is configured such that the amount of gap between adjacent windings of the wire 5 a is gradually decreased at the proximal end portion P 3 toward the proximal end side thereof, but the configuration shall not be limited to this. Even when the amount of gap between adjacent windings of the wire 5 a is constant from the distal end portion P 1 toward the proximal end portion P 3 , the distal-end flexibility of the dilator 1 (multilayer body 7 ) can be ensured, and the pushability and torquability of the dilator 1 (multilayer body 7 ) can be maintained in a case where the dilator 1 (multilayer body 7 ) is longer and curved.
- the screw effect of the single wire 5 a enables the dilator 1 to be advanced not only by a pushing operation but also by a rotational operation. Further, the diameter of a pre-formed hole can easily be increased by the coil body 5 provided at a portion where the hollow coil body 3 has an increasing outer diameter, i.e., at the intermediate portion P 2 .
- the amount of gap between adjacent windings of the wire 5 a is gradually decreased at the proximal end portion P 3 toward the proximal end side thereof.
- This configuration can have the following effect: the stiffness of the dilator 1 (the multilayer body 7 ) in the axis direction can be gradually changed so that the dilator 1 (multilayer body 7 ) can easily enter into the inside of an approach pathway even when the approach pathway meanders.
- a shaft composed of the hollow coil body 3 (the first coil) including a plurality of wires wound around into a hollow shape can improve the flexibility of the shaft and the transmissibility of torque via the shaft.
- a spirally-arranged protruding portion composed of the coil body 5 (the second coil) including the single wire 5 a wound around on the outer peripheral surface 3 L of the hollow coil body 3 can easily be formed, can ensure the flexibility of the distal end of the dilator 1 , and can improve the torquability by virtue of the elasticity of the second coil.
- each wire of the hollow coil body 3 is wound around in a direction opposite to the wire 5 a of the coil body 5 .
- the wire 5 a can be made of stainless steel, but the material shall not be limited to stainless steel.
- a metal wire made of a superelastic alloy such as nickel-titanium may be used. Further, it shall not be limited to a metal wire, and a resin wire may be used.
- the length of the dilator is, for example, 2000 mm, preferably 1600 mm to 2500 mm; the length of the distal end portion P 1 is, for example, 10 mm, preferably 0 mm to 100 mm; and the length of the intermediate portion P 2 is, for example, 30 mm, preferably 5 mm to 100 mm.
- the inner diameter of the hollow coil body 3 at the distal end is, for example, 0.7 mm, preferably 0.4 mm to 1.0 mm, and the inner diameter of the hollow coil body 3 at the proximal end is, for example, 1.5 mm, preferably 1.0 mm to 3.0 mm.
- the outer diameter of the coil body 5 at the distal end is, for example, 1.84 mm, preferably 0.8 mm to 3.0 mm, and the outer diameter of the coil body 5 at the proximal end is, for example, 2.64 mm, preferably 1.4 mm to 5.0 mm.
- the diameters of the wires 3 a to 3 h and 3 j to 3 k are, for example, 0.21 mm, preferably 0.1 mm to 0.5 mm, and the diameter of the wire 5 a is, for example, 0.36 mm, preferably 0.1 mm to 0.5 mm.
- the distal end of the connector 9 is connected to the proximal end of the hollow coil body 3 and the proximal end of the coil body 5 .
- the connector 9 is made of a resin and has a hollow shape which has an inner cavity communicating with the inner cavity 8 of the hollow coil body 3 .
- a target object is punctured using an introducer needle.
- a guide wire is inserted through an inner cavity of the introducer needle, and the introducer needle is withdrawn thereafter.
- the distal end of the dilator 1 is inserted from the proximal end of the guide wire into the punctured portion.
- the diameter of a hole at the punctured portion can be increased by pushing and rotating the dilator 1 inward.
- FIG. 4 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments.
- the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon.
- the dilator in FIG. 4 basically has the same structure as the dilator 1 in FIGS. 1-3 . Therefore, the same number is given to the same member, and a detailed description will be omitted.
- a dilator 10 includes: a multilayer body 17 including the hollow coil body 3 including the plurality of wires 3 a , 3 b , 3 c , 3 d , 3 e , 3 f , 3 g , 3 h , 3 j , and 3 k wound around into a hollow shape, the coil body 5 including the single wire 5 a wound around the surface of the hollow coil body 3 in a direction (clockwise, facing to the distal end) opposite to the hollow coil body 3 (counterclockwise, facing to the distal end); and a connector 9 having a hollow shape and being connected to the proximal end of the multilayer body 17 .
- the dilator 10 differs from the dilator 1 in that the multilayer body 17 of the dilator 10 has a distal-end portion 6 at the distal end of the hollow coil body 3 while the multilayer body 7 of the dilator 1 does not.
- the hollow coil body 3 having the distal-end portion 6 provided at the distal end corresponds to the “shaft.”
- the distal-end portion 6 is formed by casting a solder material (a silver-tin solder material, a gold-tin solder material, or the like) into the distal end of the hollow coil body 3 and has a substantially cylindrical hollow shape. Further, the surface of the distal-end portion 6 is flat (smooth) while the surface of the distal end of the multilayer body 7 is uneven.
- a solder material a silver-tin solder material, a gold-tin solder material, or the like
- the dilator 10 having the aforementioned configuration in which the distal-end portion 6 having a flat surface is connected to the distal end of the multilayer body 17 can further improve insertability into a punctured portion by first pressing the dilator against the punctured portion, and then pushing and rotating the dilator thereinto.
- FIG. 5 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments
- FIG. 6 shows the distal end portion with a view of an inner cavity of the dilator
- FIG. 7 shows a cross-sectional view taken along line VII-VII in FIG. 5 .
- the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body
- the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon.
- a dilator 20 includes: a multilayer body 27 including a hollow coil body 21 including a plurality of wires 21 a , 21 b , 21 c , 21 d , 21 e , 21 f , 21 g , 21 h , 21 j , and 21 k wound around into a hollow shape; a coil body 22 proximally spaced from a distal end of the hollow coil body 21 and including a plurality of wires 22 a , 22 b , 22 c , 22 d , 22 e , 22 f , 22 g , 22 h , 22 j , 22 k , 22 m , 22 n , 22 p , 22 q , 22 r , and 22 s wound around on an outer periphery of the hollow coil body 21 in the same direction (counterclockwise, facing to the distal end) as the hollow coil body 21 ; a coil body 23 proximally spaced from
- wires 21 a , 21 b , 21 c , 21 d , 21 e , 21 f , 21 g , 21 h , 21 j , and 21 k correspond to the “third wires,” and the hollow coil body 21 corresponds to the “third layer body.”
- the wires 22 a . 22 b , 22 c , 22 d , 22 e , 22 f , 22 g , 22 h , 22 j , 22 k , 22 m , 22 n , 22 p , 22 q , 22 r , and 22 s corresponds to the “fourth wires,” and the coil body 22 corresponds to the “fourth layer body” and the “portion having an increasing outer diameter.”
- the wire 24 a corresponds to the “fifth wire”
- the coil body 24 corresponds to the “fifth layer body.”
- wires 23 a correspond to the “sixth wires”
- coil body 23 corresponds to the “sixth layer body.”
- the hollow coil body 21 is configured such that the wires 21 a , 21 b , 21 c , 21 d , 21 e , 21 f , 21 g , 21 h , 21 j , and 21 k are 10 wires (e.g., stainless steel wires) that are twisted into a hollow shape as shown in FIG. 7 .
- the hollow coil body 21 has a cylindrical hollow shape from the distal end to the connector 9 .
- the dotted line (the innermost among the three dotted lines) represents the common inscribed line of the hollow coil body 21 .
- An inner cavity 28 is formed in the inner side of the common inscribed line of the hollow coil body 21 (see FIG. 7 ).
- the coil body 22 is formed such that the wires 22 a , 22 b , 22 c , 22 d , 22 e , 22 f , 22 g , 22 h , 22 j , 22 k , 22 m , 22 n , 22 p , 22 q , 22 r , and 22 s are 16 wires (e.g., stainless steel wires) that are twisted on a surface of the coil body 21 as shown in FIG. 7 .
- the coil body 22 also has a cylindrical hollow shape from the distal end to the connector 9 .
- the dotted line (the intermediate among the three dotted lines) represents the common inscribed line of the coil body 22 .
- the coil body 23 is formed such that the wires 23 a are 23 wires (e.g., stainless steel wires) that are twisted on a surface of the coil body 22 .
- the coil body 23 also has a cylindrical hollow shape from the distal end to the connector 9 .
- the dotted line (the outermost among the three dotted lines) represents the common inscribed line of the hollow coil body 23 .
- the coil body 22 is twistedly formed on the surface of the hollow coil body 21 . This means that the shaft formed from the hollow coil body 21 and the coil body 22 has a hollow shape and an outer diameter that is smaller at a distal end than at a proximal end.
- the coil body 24 is formed such that the wire 24 a (e.g., a stainless steel wire) is wound on the surface of the coil body 21
- the coil body 25 is formed such that the wire 25 a (e.g., a stainless steel wire) is wound on the surface of the coil body 22 .
- Each element wire in the hollow coil body 21 , the coil body 22 , and the coil body 23 is wound around closely, and in the coil body 24 and the coil body 25 , a wire is wound around with gaps between adjacent windings (see FIG. 6 ).
- the coil body 24 provides a spirally-arranged protruding portion protruding outwardly (the outermost surface of the dilator 20 , the outermost portion) on an outer peripheral surface 21 L of the hollow coil body 21
- the coil body 25 provides a spirally-arranged protruding portion protruding outwardly (the outermost surface of the dilator 20 , the outermost portion) on an outer peripheral surface 22 T of the coil body 22 .
- the spirally-arranged protruding portion has gaps between adjacent portions (adjacent portions of the wire) along an axis A of the hollow coil body 21 .
- the coil body 25 is provided on the coil body 22 as a portion in which the shaft has an increasing outer diameter.
- metal wires made of stainless steel can be used for the wires of the hollow coil body 21 , the coil body 22 , the coil body 23 , the coil body 24 , and the coil body 25 , but they are not limited to stainless steel wires. They may be made of a superelastic alloy such as nickel-titanium. Further, they are not limited to metal wires and may be resin wires.
- the dilator 20 (the multilayer body 27 ) can ensure the distal-end flexibility of the dilator 20 (the multilayer body 27 ) and can maintain the pushability and torquability of the dilator 20 (the multilayer body 27 ) even when the dilator 20 (the multilayer body 27 ) is longer and curved.
- the screw effect of the single wire 24 a and the single wire 25 a enables the dilator 20 to be advanced not only by a pushing operation but also by a rotational operation.
- the diameter of a pre-formed hole can easily be increased by the coil body 25 provided at the coil body 22 which corresponds to a portion where the shaft has an increasing outer diameter.
- the stiffness of the dilator 20 (the multilayer body 27 ) along the axis direction can be gradually changed so that the dilator 20 (the multilayer body 27 ) can easily enter into the inside of an approach pathway even when the approach pathway meanders.
- the shaft (the first coil) composed of the hollow coil body 21 and the coil body 22 each including a plurality of wires wound around into a hollow shape can improve the flexibility of the shaft and the transmissibility of torque via the shaft.
- the spirally-arranged protruding portion (the second coil) composed of the coil body 24 including a single wire wound around on the outer peripheral surface 21 L of the hollow coil body 21 and the coil body 25 wound around on the outer peripheral surface 22 T of the coil body 22 can be easily formed, can ensure the flexibility of the distal end of the dilator 20 by virtue of the elasticity of the second coil, and can improve the torquability.
- the wires of the hollow coil body 21 and the coil body 22 are wound in a direction opposite to the wires of the coil body 24 and the coil body 25 . Therefore, even when the dilator 20 is rotated in a direction to open the hollow coil body 21 and the coil body 22 , a force is applied in a direction to close the coil body 24 and the coil body 25 to prevent the opening of the hollow coil body 21 and the coil body 22 . This allows a force applied to the connector 9 of the dilator 20 to be transmitted to the distal end side.
- FIG. 8 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments.
- the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon.
- a dilator 30 includes: a multilayer body 37 including a hollow coil body 31 including a plurality of wires 31 a , 31 b , 31 c , 31 d , 31 e , 31 f , 31 g , 31 h , 31 j , and 31 k wound around into a hollow shape; a coil body 32 including a single wire 32 a wound around on an outer periphery of the hollow coil body 31 from a distal end of the hollow coil body 31 in a direction (clockwise, facing to the distal end) opposite to the hollow coil body 31 ; a coil body 33 proximally spaced from a distal end of the coil body 32 and including a plurality of wires 33 a (only one of the wires 33 a is indicated by the reference number in FIG.
- the dilator 30 further includes a connector 9 (not shown) having a hollow shape and being connected to a proximal end of the multilayer body 37 .
- the multilayer body 37 has a stepped and cylindrical hollow shape as in the multilayer body 27 , but it differs from the multilayer body 27 in that the coil body 32 in the multilayer body 37 is formed integrally and continuously while the coil body 22 and the coil body 24 in the multilayer body 27 are formed as separate members. That is, in the coil body 32 , the wire 32 a is wound around closely at the proximal end side while wound around with gaps between adjacent windings at the distal end side as shown in FIG. 8 .
- the hollow coil body 31 and a portion of the coil body 32 where the wire 32 a is wound around closely together correspond to the “shaft” and the “first coil.”
- the coil body 35 and the portion of the coil body 32 where the wire 32 a is wound around with gaps between adjacent windings together correspond to the “spirally-arranged protruding portion” and the “second coil.”
- the portion of the coil body 32 where the wire 32 a is wound around closely corresponds to the “portion having an increasing outer diameter.”
- the hollow coil body 31 is formed such that the wires 31 a , 31 b , 31 c , 31 d , 31 e , 31 f , 31 g , 31 h , 31 j , and 31 k are 10 wires (e.g., stainless steel wires) that are twisted into a hollow shape as in the hollow coil body 21 .
- the hollow coil body 31 has a cylindrical hollow shape from the distal end to the connector 9 .
- the coil body 32 is formed such that the wire 32 a (e.g., a stainless steel wire) is wound around a surface of the coil body 31 .
- the coil body 32 also has a cylindrical hollow shape from the distal end to the connector 9 .
- the coil body 33 is formed such that the wires 33 a are 23 wires (e.g., stainless steel wires) that are twisted on a surface of the coil body 32 .
- the hollow coil body 33 also has a cylindrical hollow shape from the distal end to the connector 9 .
- a closely wound portion of the coil body 32 is twistedly formed on the surface of the hollow coil body 31 .
- the shaft formed from the hollow coil body 31 and the closely wound portion of the coil body 32 has a hollow shape having an outer diameter that is smaller at a distal end than at a proximal end.
- the coil body 35 is formed such that the wire 35 a (e.g., a stainless steel wire) is formed on the surface of the coil body 32 .
- the wire 35 a e.g., a stainless steel wire
- Each wire in the hollow coil body 31 and the coil body 33 is wound around closely (see FIG. 8 ).
- the portion of the coil body 32 where the wire is wound around with gaps between adjacent windings provides a spirally-arranged protruding portion protruding outwardly (the outermost surface of the dilator 30 , the outermost portion) on an outer peripheral surface 31 L of the hollow coil body 31
- the coil body 35 provides a spirally-arranged protruding portion protruding outwardly (the outermost surface of the dilator 30 , the outermost portion) on an outer peripheral surface 32 B of the closely wound portion of the coil body 32 .
- spirally-arranged protruding portions each have gaps between adjacent portions (adjacent windings of the wire) along an axis A of the hollow coil body 31 .
- the coil body 35 is provided at the closely wound portion of the coil body 32 , which corresponds to a portion where the shaft has an increasing outer diameter.
- metal wires made of stainless steel can be used for the wires of the hollow coil body 31 , the coil body 32 , the coil body 33 , and the coil body 35 , but they are not limited to stainless steel wires. They may be those made of a superelastic alloy such as nickel-titanium. Further, they are not limited to metal wires and may be resin wires.
- the dilator 30 (the multilayer body 37 ) can ensure the distal-end flexibility of the dilator 30 (the multilayer body 37 ) and can maintain the pushability and torquability of the dilator 30 (the multilayer body 37 ) even when the dilator 30 (the multilayer body 37 ) is longer and curved. Further, the screw effect of the single wire 32 a and the single wire 35 a extending contiguously toward the distal end from the proximal end of the coil body 32 can further be improved when the multilayer body 37 is rotated. This enables the dilator 30 to be easily advanced not only by a pushing operation but also by a rotational operation. In addition, the coil body 35 is provided in the closely wound portion of the coil body 32 , which corresponds to a portion where the shaft has an increasing outer diameter. Therefore, the diameter of a pre-formed hole can be increased more easily.
- the stiffness of the dilator 30 (the multilayer body 37 ) along the axis direction can be gradually changed so that the dilator 30 (the multilayer body 37 ) can easily enter into the inside of an approach pathway even when the approach pathway meanders.
- a shaft (the first coil) composed of the hollow coil body 31 including a plurality of wires wound around into a hollow shape, and the coil body 32 can improve the flexibility of the shaft and the transmissibility of torque via the shaft.
- a spirally-arranged protruding portion (the second coil) composed of the coil body 32 including a single wire wound around the outer peripheral surface 31 L of the hollow coil body 31 and the coil body 35 wound around the outer peripheral surface 32 B of the coil body 32 can be easily formed, can ensure the flexibility of the distal end of the dilator 30 by virtue of the elasticity of the second coil, and can improve the torquability.
- the wires of the hollow coil body 31 are wound in a direction opposite to the wires of the coil body 32 and the coil body 35 .
- FIG. 9 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments.
- the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon.
- a dilator 40 includes: a multilayer body 47 including a hollow coil body 41 including a plurality of wires 41 a , 41 b , 41 c , 41 d , 41 e , 41 f , 41 g , 41 h , 41 j , and 41 k wound around into a hollow shape; a coil body 42 proximally spaced from a distal end of the hollow coil body 41 and including a plurality of wires 42 a , 42 b , 42 c , 42 d , 42 e , 42 f , 42 g , 42 h , 42 j , 42 k , 42 m , 42 n , 42 p , 42 q , 42 r , and 42 s wound around on an outer periphery of the hollow coil body 41 in the same direction (counterclockwise, facing to the distal end) as the hollow coil body 21 (counterclockwise, facing to the distal end); a
- the multilayer body 47 has a stepped and cylindrical hollow shape as in the multilayer body 27 , but it differs from the multilayer body 27 in that the coil body 43 in the multilayer body 47 is formed integrally and continuously while the coil body 25 and the coil body 23 in the multilayer body 27 are formed as separate members. That is, in the coil body 43 , the wire 43 a is wound around closely at the proximal end side while wound around with gaps between adjacent windings at the distal end side as shown in FIG. 9 .
- hollow coil body 41 and the coil body 42 together correspond to the “shaft” and the “first coil.”
- the coil body 42 corresponds to the “portion having an increasing outer diameter.”
- the hollow coil body 41 is formed such that the wires 41 a , 41 b , 41 c , 41 d , 41 e , 41 f , 41 g , 41 h , 41 j , and 41 k are 10 wires (e.g., stainless steel wires) that are twisted into a hollow shape as in the hollow coil body 21 .
- the hollow coil body 41 has a cylindrical hollow shape from the distal end to the connector 9 .
- the coil body 42 is formed such that the wires 42 a , 42 b , 42 c , 42 d , 42 e , 42 f , 42 g , 42 h , 42 j , 42 k , 42 m , 42 n , 42 p , 42 q , 42 r , and 42 s are 16 wires (e.g., stainless steel wires) that are wound around on a surface of the coil body 41 in the same direction (counterclockwise, facing to the distal end) as the hollow coil body 41 .
- the coil body 42 also has a cylindrical hollow shape from the distal end to the connector 9 .
- the coil body 43 is formed such that the wire 43 a (e.g., a stainless steel wire) is wound around on a surface of the coil body 42 .
- the hollow coil body 43 also has a cylindrical hollow shape from the distal end to the connector 9 .
- the coil body 44 is formed such that the wire 44 a (e.g., a stainless steel wire) is wound around the surface of the coil body 41 in the same direction (clockwise, facing to the distal end) as the coil body 43 (clockwise, facing to the distal end).
- wire 44 a e.g., a stainless steel wire
- Each wire in the hollow coil body 41 and the coil body 42 is wound around closely (see FIG. 9 ).
- the coil body 42 is twistedly formed on the surface of the hollow coil body 41 .
- the shaft formed by the hollow coil body 41 and the coil body 42 has a hollow shape having an outer diameter that is smaller at a distal end than at a proximal end.
- the coil body 44 provides a spirally-arranged protruding portion protruding outwardly (the outermost surface of the dilator 40 , the outermost portion) on an outer peripheral surface 41 L of the hollow coil body 41
- the coil body 43 provides a spirally-arranged protruding portion protruding outwardly (the outermost surface of the dilator 40 , the outermost portion) on an outer peripheral surface 42 T of the coil body 42 .
- These spirally-arranged protruding portions each have gaps between adjacent portions (adjacent windings of the wire) along an axis A of the hollow coil body 41 .
- the coil body 43 is provided on the coil body 42 , which corresponds to a portion where the shaft has an increasing outer diameter.
- metal wires made of stainless steel can be used for the wires of the hollow coil body 41 , the coil body 42 , the coil body 43 , and the coil body 44 , but they are not limited to stainless steel wires. They may be made of a superelastic alloy such as nickel-titanium. Further, they are not limited to metal wires and may be resin wires.
- the dilator 40 (the multilayer body 47 ) can ensure the distal-end flexibility of the dilator 40 (the multilayer body 47 ) and can maintain the pushability and torquability of the dilator 40 (the multilayer body 47 ) even when the dilator 40 (the multilayer body 47 ) is longer and curved. Further, the screw effect of the single wire 43 a and the single wire 44 a extending contiguously toward the distal end from the proximal end of the coil body 43 can further be improved when the multilayer body 47 is rotated. This enables the dilator 40 to be easily advanced not only by a pushing operation but also by a rotational operation. In addition, the diameter of a pre-formed hole can be increased more easily by the coil body 43 provided at the coil body 42 which corresponds to a portion where the shaft has an increasing outer diameter.
- the stiffness of the dilator 40 (the multilayer body 47 ) along the axis direction can be gradually changed so that the dilator 40 (the multilayer body 47 ) can easily enter into the inside of an approach pathway even when the approach pathway meanders.
- a shaft (the first coil) composed of the hollow coil body 41 and the coil body 42 each including a plurality of wires wound around into a hollow shape can improve the flexibility of the shaft and the transmissibility of torque via the shaft.
- a spirally-arranged protruding portion (the second coil) composed of the coil body 44 including a single wire wound around on the outer peripheral surface 41 L of the hollow coil body 41 and the coil body 43 wound around on an outer peripheral surface 42 T of the coil body 42 can be easily formed, can ensure the flexibility of the distal end of the dilator 40 by virtue of the elasticity of the second coil, and can improve the torquability.
- wires of the hollow coil body 41 and the coil body 42 are wound in a direction opposite to the wires of the coil body 43 and the coil body 44 . Therefore, even when the dilator 40 is rotated in a direction to open the hollow coil body 41 and the coil body 42 , a force is applied in a direction to close the coil body 43 and the coil body 44 to prevent the opening of the hollow coil body 41 and the coil body 42 . This allows a force applied to the connector 9 of the dilator 40 to be transmitted to the distal end side.
- FIG. 10 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments.
- the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon.
- a dilator 50 includes: a multilayer body 57 including a hollow coil body 51 including a plurality of wires 51 a , 51 b , 51 c , 51 d , 51 e , 51 f , 51 g , 51 h , 51 j , and 51 k wound around into a hollow shape; a coil body 52 proximally spaced from a distal end of the hollow coil body 51 and including a plurality of element wires 52 a , 52 b , 52 c , 52 d , 52 e , 52 f , 52 g , 52 h , 52 j , 52 k , 52 m , 52 n , 52 p , 52 q , 52 r , and 52 s wound around on an outer periphery of the hollow coil body 51 in the same direction (counterclockwise, facing to the distal end) as the hollow coil body 51 (counterclockwise, facing to the distal end);
- the multilayer body 57 has a stepped and cylindrical hollow shape as in the multilayer body 27 , but it differs from the multilayer body 27 in that the coil body 53 in the multilayer body 57 is formed integrally and continuously while the coil body 24 , the coil body 25 , and the coil body 23 in the multilayer body 27 are formed as separate members. That is, in the coil body 53 , the single wire 53 a is wound around closely at the proximal end side and wound around with gaps between adjacent windings at the distal end side of the coil body 52 and the distal end side of the coil body 51 .
- the hollow coil body 51 and the coil body 52 together correspond to the “shaft” and the “first coil.”
- the portion of the coil body 53 wound around with gaps between adjacent windings corresponds to the “spirally-arranged protruding portion” and the “second coil.”
- the coil body 52 corresponds to the “portion having an increasing outer diameter.”
- the hollow coil body 51 is formed such that the wires 51 a , 51 b , 51 c , 51 d , 51 e , 51 f . 51 g , 51 h , 51 j , and 51 k are 10 wires (e.g., stainless steel wires) that are twisted into a hollow shape as in the hollow coil body 21 .
- the hollow coil body 51 has a cylindrical hollow shape from the distal end to the connector 9 .
- the coil body 52 is formed such that the wires 52 a , 52 b , 52 c , 52 d , 52 e , 52 f , 52 g , 52 h , 52 j , 52 k , 52 m , 52 n , 52 p , 52 q , 52 r , and 52 s are 16 wires (e.g., stainless steel wires) that are wound around on a surface of the coil body 51 in the same direction (counterclockwise, facing to the distal end) as the hollow coil body 51 .
- the coil body 52 also has a cylindrical hollow shape from the distal end to the connector 9 .
- the coil body 53 is formed such that the wire 53 a (e.g., a stainless steel wire) is wound around on the surfaces of the coil body 51 and the coil body 52 .
- the hollow coil body 53 also has a cylindrical hollow shape from the distal end to the connector 9 .
- Each wire in the hollow coil body 51 and the coil body 52 is wound around closely (see FIG. 10 ).
- the coil body 52 is twistedly formed on the surface of the hollow coil body 51 .
- the coil body 53 provides a spirally-arranged protruding portion protruding outwardly (from the outermost surface and the outermost portion of the dilator 50 ) on an outer peripheral surface 51 L of the hollow coil body 51 and an outer peripheral surface 52 T of the coil body 52 .
- the above spirally-arranged protruding portion has gaps between adjacent portions (adjacent windings of the wire) along an axis A of the hollow coil body 51 . Further, the coil body 53 is provided at the coil body 52 , which corresponds to a portion where the shaft has an increasing outer diameter.
- metal wires made of stainless steel can be used for the wires of the hollow coil body 51 , the coil body 52 , and the coil body 53 , but they are not limited to stainless steel wires. They may be made of a superelastic alloy such as nickel-titanium. Further, they are not limited to metal wires and may be resin wires.
- the dilator 50 (the multilayer body 57 ) can ensure the distal-end flexibility of the dilator 50 (the multilayer body 57 ) and can maintain the pushability and torquability of the dilator 50 (the multilayer body 57 ) even when the dilator 50 (the multilayer body 57 ) is longer and curved. Further, the screw effect of the single wire 53 a extending contiguously toward the distal end from the proximal end of the coil body 53 can further be improved when the multilayer body 57 is rotated. This enables the dilator 50 to be easily advanced not only by a pushing operation but also by a rotational operation. In addition, the diameter of a pre-formed hole can be increased more easily by the coil body 53 provided at the coil body 52 which corresponds to a portion where the shaft has an increasing outer diameter.
- the stiffness of the dilator 50 (the multilayer body 57 ) along the axis direction can be gradually changed so that the dilator 50 (the multilayer body 57 ) can easily enter into the inside of an approach pathway even when the approach pathway meanders.
- a shaft (the first coil) composed of the hollow coil body 51 and the coil body 52 each including a plurality of wires wound around into a hollow shape can improve the flexibility of the shaft and the transmissibility of torque via the shaft.
- a spirally-arranged protruding portion (the second coil) composed of the coil body 53 including a single wire wound around the outer peripheral surface 51 L of the hollow coil body 51 and the outer peripheral surface 52 T of the hollow coil body 52 can be easily formed, can ensure the flexibility of the distal end of the dilator 50 by virtue of the elasticity of the second coil, and can improve the torquability.
- the wires of the hollow coil body 51 and the coil body 52 are wound in a direction opposite to the wire of the coil body 53 .
- FIG. 11 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments.
- the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon.
- a dilator 60 includes: a multilayer body 67 including a hollow coil body 61 including a plurality of wires 61 a , 61 b , 61 c , 61 d , 61 e , 61 f , 61 g , 61 h , 61 j , and 61 k wound around into a hollow shape; a coil body 62 proximally spaced from a distal end of the hollow coil body 61 and including a plurality of wires 62 a , 62 b , 62 c , 62 d , 62 e , 62 f , 62 g , 62 h , 62 j , 62 k , 62 m , 62 n , 62 p , 62 q , 62 r , and 62 s wound around on an outer periphery of the hollow coil body 61 in the same direction (
- the distal-end portion 66 is formed by casting a solder material (a silver-tin solder material, a gold-tin solder material, or the like) into the distal end of the hollow coil body 61 , and has a substantially cylindrical hollow shape. Further, the surface of the distal-end portion 66 is flat while the surface of the distal end of the multilayer body 57 is uneven.
- a solder material a silver-tin solder material, a gold-tin solder material, or the like
- the multilayer body 67 has a stepped and cylindrical hollow shape as in the multilayer body 27 , but it differs from the multilayer body 27 in that the coil body 63 in the multilayer body 67 is formed integrally and continuously while the coil body 24 , the coil body 25 , and the coil body 23 in the multilayer body 27 are formed as separate members. That is, in the coil body 63 , the single wire 63 a is closely wound around at the proximal end side and is wound around with gaps between adjacent windings at the distal end side of the coil body 62 and the distal end side of the coil body 61 .
- the hollow coil body 61 and the coil body 62 together correspond to the “shaft” and the “first coil.”
- the portion of the coil body 63 wound around with gaps between adjacent windings corresponds to the “spirally-arranged protruding portion” and the “second coil.”
- the coil body 62 corresponds to the “portion having an increasing outer diameter.”
- the hollow coil body 61 is formed such that the wires 61 a , 61 b , 61 c , 61 d , 61 e , 61 f , 61 g , 61 h , 61 j , and 61 k are 10 wires (e.g., stainless steel wires) that are twisted into a hollow shape as in the hollow coil body 21 .
- the hollow coil body 61 has a cylindrical hollow shape from the distal end to the connector 9 .
- the coil body 62 is formed such that the wires 62 a , 62 b , 62 c , 62 d , 62 e , 62 f , 62 g , 62 h , 62 j , 62 k , 62 m , 62 n , 62 p , 62 q , 62 r , and 62 s are 16 wires (e.g., stainless steel wires) that are wound around on a surface of the coil body 61 in the same direction (counterclockwise, facing to the distal end) as the hollow coil body 61 .
- the hollow coil body 62 also has a cylindrical hollow shape from the distal end to the connector 9 .
- the coil body 63 is formed such that the wire 63 a (e.g., a stainless steel wire) is wound around on the surfaces of the coil body 61 and the coil body 62 .
- the hollow coil body 63 also has a cylindrical hollow shape from the distal end to the connector 9 .
- Each wire in the hollow coil body 61 and the coil body 62 is wound around closely (see FIG. 11 ).
- the coil body 62 is twistedly formed on the surface of the hollow coil body 61 .
- This means that the shaft formed from the hollow coil body 61 and the coil body 62 has a hollow shape having an outer diameter that is smaller at a distal end than at a proximal end.
- the coil body 63 provides a spirally-arranged protruding portion protruding outwardly (the outermost surface of the dilator 60 , the outermost portion) on an outer peripheral surface 61 L of the hollow coil body 61 and an outer peripheral surface 62 T of the coil body 62 .
- the above spirally-arranged protruding portion has gaps between adjacent portions (adjacent windings of the wire) along an axis A of the hollow coil body 61 . Further, the coil body 63 is provided at the coil body 62 which corresponds to a portion where the shaft has an increasing outer diameter.
- metal wires made of stainless steel can be used for the wires of the hollow coil body 61 , the coil body 62 , and the coil body 63 , but they are not limited to stainless steel wires. They may be made of a superelastic alloy such as nickel-titanium. Further, they are not limited to metal wires and may be resin wires.
- the distal-end portion 66 having a flat surface is connected to the distal end of the multilayer body 67 .
- This configuration can further improve insertability into a punctured portion by first pressing the dilator against the punctured portion, and then pushing and rotating the dilator inward.
- this configuration can ensure the distal-end flexibility of the dilator 60 (the multilayer body 67 ) and can improve the pushability and torquability of the dilator 60 (the multilayer body 67 ) even when the dilator 60 (the multilayer body 67 ) is longer and curved.
- the screw effect of the single wire 63 a extending contiguously toward the distal end from the proximal end of the coil body 63 can further be improved when the multilayer body 67 is rotated.
- This enables the dilator 60 to be easily advanced not only by a pushing operation but also by a rotational operation.
- the diameter of a pre-formed hole can be increased more easily by the coil body 63 provided at the coil body 62 which corresponds to a portion where the shaft has an increasing outer diameter.
- the stiffness of the dilator 60 (the multilayer body 67 ) along the axis direction can be gradually changed so that the dilator 60 (the multilayer body 67 ) can easily enter into the inside of an approach pathway even when the approach pathway meanders.
- the shaft (the first coil) composed of the hollow coil body 61 and the coil body 62 each including a plurality of wires wound around into a hollow shape can improve the flexibility of the shaft and the transmissibility of torque via the shaft.
- a spirally-arranged protruding portion (the second coil) composed of the coil body 63 including a single wire wound around on an outer peripheral surface 61 L of the hollow coil body 61 and an outer peripheral surface 62 T of the hollow coil body 62 can be easily formed, can ensure the flexibility of the distal end of the dilator 60 by virtue of the elasticity of the second coil, and can improve the torquability.
- the wires of the hollow coil body 61 and the coil body 62 are wound in a direction opposite to the wire of the coil body 63 . Therefore, even when the dilator 60 is rotated in a direction to open the hollow coil body 61 and the coil body 62 , a force is applied in a direction to close the coil body 63 to prevent the opening of the hollow coil body 61 and the coil body 62 . This allows a force applied to the connector 9 of the dilator 60 to be transmitted to the distal end side.
- FIG. 12 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments.
- the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon.
- a dilator 70 includes: a multilayer body 77 including a hollow coil body 21 including a plurality of wires 21 a , 21 b , 21 c , 21 d , 21 e , 21 f , 21 g , 21 h , 21 j , and 21 k wound around into a hollow shape; a coil body 22 proximally spaced from a distal end of the hollow coil body 21 and including a plurality of wires 22 a , 22 b , 22 c , 22 d , 22 e , 22 f , 22 g , 22 h , 22 j , 22 k , 22 m , 22 n , 22 p , 22 q , 22 r , and 22 s wound around on an outer periphery of the hollow coil body 21 in a direction (clockwise, facing to the distal end) opposite to the hollow coil body 21 ; and a coil body 24 including a single wire
- the multilayer body 77 has a stepped and cylindrical hollow shape as in the multilayer body 27 but has a two-layer structure where the coil 25 and the coil 23 are removed from the multilayer body 27 .
- the dilator 70 (the multilayer body 77 ) can ensure the distal-end flexibility of the dilator 70 (the multilayer body 77 ), can maintain the pushability and torquability of the dilator 70 (the multilayer body 77 ), and can enable the diameter of a pre-formed hole to be easily increased by the screw effect of the wire 24 a upon rotation of the multilayer body 77 .
- the multilayer body 77 has a two-layer structure while the multilayer body 27 has a three-layer structure. Therefore, the multilayer body 77 may have a somewhat inferior ability for increasing the diameter of a hole as compared with the multilayer body 27 .
- the stiffness of the dilator 70 (the multilayer body 77 ) along the axis direction can be gradually changed so that the dilator 70 (the multilayer body 77 ) can easily enter into the inside of an approach pathway even when the approach pathway meanders.
- FIG. 13 shows an overall view of a dilator according to the disclosed embodiments.
- the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon.
- a dilator 80 includes a shaft 81 , a spirally-arranged protruding portion 82 , and a connector 9 connected to a proximal end of the shaft 81 .
- the shaft 81 has a hollow shape in which an inner cavity 81 a is formed extending penetratingly from the proximal end to a distal end of the shaft 81 .
- the shaft 81 also has a body portion 83 , a tapered portion 84 , and a distal-end portion 85 .
- the materials of the shaft 81 and the spirally-arranged protruding portion 82 can be used: stainless steel; superelastic alloy materials such as nickel-titanium alloys; or synthetic resins such as polyvinyl chloride resin, urethane resin, polyolefin resin, polyamide resin, and fluororesin.
- the body portion 83 is located at the proximal end side of the dilator 80 , and the connector 9 is connected to a proximal end thereof. Further, the body portion 83 has a substantially constant outer diameter from the proximal end thereof through the distal end.
- the tapered portion 84 is connected to the distal end of the body portion 83 , extends from that distal end to the distal end side, and has a shape tapered toward the distal end side. That is, the tapered portion 84 is configured such that the outer diameter of the distal end side thereof is smaller than that of the proximal end side and corresponds to a portion having an outer diameter increasing toward the proximal end side from the distal end side of the shaft 81 .
- the distal-end portion 85 is connected to the distal end of the tapered portion 84 and extends from that distal end to the distal end side. Further, the distal-end portion 85 has a substantially constant outer diameter from the proximal end to the distal end thereof. As described above, the shaft 81 has a hollow shape having an outer diameter that is smaller at the distal end than at the proximal end.
- the spirally-arranged protruding portion 82 is provided on an outer peripheral surface 81 B of the shaft 81 so as to be protruding outwardly (from the outermost surface of the dilator 80 , the outermost portion).
- the spirally-arranged protruding portion 82 is provided at a distal-end side portion of the body portion 83 , at the tapered portion 84 , and at the distal-end portion 85 and has gaps between adjacent portions along an axis A of the shaft 81 . That is, the adjacent portions of the spirally-arranged protruding portion 82 are spaced from each other. The gaps are configured so as to be gradually smaller toward the proximal end side from the distal end side of the shaft 81 .
- the spirally-arranged protruding portion 82 is integrally formed with the shaft 81 by casting or the like.
- the spirally-arranged protruding portion 82 protruding outwardly is provided on the outer peripheral surface 81 B of the shaft 81 and has gaps between adjacent portions along the axis A of the shaft 81 .
- This configuration enables the dilator to be advanced not only by a conventional pushing operation but also by a rotational operation of the spirally-arranged protruding portion 82 .
- spirally-arranged protruding portion 82 provided at a portion having an outer diameter increasing toward the proximal end side from the distal end side of the shaft, that is, at the tapered portion 84 , can easily increase the diameter of a pre-formed hole.
- the gaps of the spirally-arranged protruding portions 82 configured so as to be gradually smaller toward the proximal end side from the distal end side of the shaft 81 can gradually change the stiffness of the shaft 81 along the axis direction. This can ensure the flexibility of the distal end of the shaft 81 and can maintain the pushability and torquability of the shaft 81 even when the shaft 81 is longer and curved.
- FIG. 14 shows a partial cross-sectional view of a distal-end side portion of a dilator according to the disclosed embodiments.
- the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon.
- a dilator 90 includes a shaft 91 , a spirally-arranged protruding portion 92 , and a connector 9 (not shown) connected to a proximal end of the shaft 91 .
- the material(s) of the shaft 91 and the spirally-arranged protruding portion 92 is/are the same as that/those of the shaft 81 and the spirally-arranged protruding portion 82 of the dilator 80 .
- the shaft 91 has a hollow shape in which an inner cavity 91 a is formed extending penetratingly from the proximal end to a distal end of the shaft 91 . Further, the shaft 91 has a body portion 93 and a tapered portion 94 .
- the dilator 90 differs from the dilator 80 in that the dilator 90 does not have a distal-end portion.
- the body portion 93 and the tapered portion 94 have the same configurations as the body portion 83 and the tapered portion 84 of the dilator 80 .
- the spirally-arranged protruding portion 92 is provided on an outer peripheral surface 91 B of the shaft 91 so as to be protruding outwardly (the outermost surface of the dilator 90 , the outermost portion).
- the spirally-arranged protruding portion 92 is provided at a distal-end side portion of the body portion 93 and at the tapered portion 94 and has gaps between adjacent portions along an axis A of the shaft 91 . That is, the adjacent portions of the spirally-arranged protruding portion 92 are spaced from each other.
- the gaps are configured so as to be gradually smaller toward the proximal end side from the distal end side of the shaft 91 .
- the spirally-arranged protruding portion 92 is integrally formed with the shaft 91 by casting or the like.
- the spirally-arranged protruding portion 92 protruding outwardly is provided on the outer peripheral surface 91 B of the shaft 91 and has gaps between adjacent portions along the axis A of the shaft 91 as described above.
- the spirally-arranged protruding portion 92 is provided at a portion having an outer diameter increasing from the distal end side to the proximal end side of the shaft, i.e., at the tapered portion 94 .
- the gaps of the spirally-arranged protruding portions 92 are configured so as to be gradually smaller toward the proximal end side from the distal end side of the shaft 91 . Therefore, the dilator 90 can produce similar effects as the dilator 80 .
- FIG. 15 shows a partial cross-sectional view of a distal-end side portion of a dilator according to the disclosed embodiments.
- the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon.
- a dilator 100 includes a shaft 101 , a spirally-arranged protruding portion 102 , and a connector 9 (not shown) connected to a proximal end of the shaft 101 .
- the material(s) of the shaft 101 and the spirally-arranged protruding portion 102 is/are the same as that/those of the shaft 81 and the spirally-arranged protruding portion 82 of the dilator 80 .
- the shaft 101 has a hollow shape in which an inner cavity 101 a is formed extending penetratingly from a proximal end to a distal end. Further, the shaft 101 has a tapered portion 104 .
- the dilator 100 differs from the dilator 80 in that the dilator 100 does not have either a distal-end portion or a body portion. That is, the shaft 101 has a tapered shape having an outer diameter gradually decreasing from a proximal end to a distal end throughout its entire length. This means that the shaft 101 has a hollow shape having an outer diameter that is smaller at the distal end than at the proximal end.
- the spirally-arranged protruding portion 102 is provided on an outer peripheral surface 101 B of the shaft 101 so as to be protruding outwardly (the outermost surface of the dilator 100 , the outermost portion).
- the spirally-arranged protruding portion 102 is provided at a distal-end side portion of the tapered portion 104 and has gaps between adjacent portions along an axis A of the shaft 101 . That is, the adjacent portions of the spirally-arranged protruding portion 102 are spaced from each other. The gaps are configured so as to be gradually smaller toward the proximal end side from the distal end side of the shaft 101 .
- the spirally-arranged protruding portion 102 is integrally formed with the shaft 101 by casting or the like.
- the spirally-arranged protruding portion 102 protruding outwardly is provided on the outer peripheral surface 101 B of the shaft 101 and has gaps between adjacent portions along the axis A of the shaft 101 as described above.
- the spirally-arranged protruding portion 102 is provided at the tapered portion 104 which corresponds to a portion having an outer diameter increasing toward the proximal end side from the distal end side of the shaft.
- the gaps of the spirally-arranged protruding portions 102 are configured so as to be gradually smaller toward the proximal end side from the distal end side of the shaft 101 . Therefore, the dilator 100 can produce similar effects as the dilator 80 .
- FIG. 16 shows a partial cross-sectional view of a distal-end side portion of a dilator according to the disclosed embodiments.
- the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon.
- a dilator 110 includes a shaft 111 , a spirally-arranged protruding portion 112 , and a connector 9 (not shown) connected to a proximal end of the shaft 111 .
- the material(s) of the shaft 111 and the spirally-arranged protruding portion 112 is/are the same as that/those of the shaft 81 and the spirally-arranged protruding portion 82 of the dilator 80 .
- the shaft 111 has a hollow shape in which an inner cavity 111 a is formed extending penetratingly from the proximal end to a distal end of the shaft 111 . Further, the shaft 111 has a body portion 113 and a distal-end portion 115 .
- the body portion 113 is located at the proximal end side of the dilator 110 , and the connector 9 is connected to a proximal end thereof. Further, the body portion 113 has a substantially constant outer diameter from the proximal end to the distal end thereof.
- the distal-end portion 115 is connected to the distal end of the body portion 113 and extends from that distal end to the distal end side. Further, the distal-end portion 115 has a substantially constant outer diameter from the proximal end to the distal end thereof. The outer diameter of the distal-end portion 115 is smaller than that of the body portion 113 , and the distal-end portion 115 is formed coaxially with the body portion 113 .
- the shaft 111 has a hollow shape having an outer diameter that is smaller at a distal end than at a proximal end. Further, the body portion 113 corresponds to a portion having an outer diameter increasing from the distal end side to the proximal end side of the shaft 111 .
- the spirally-arranged protruding portion 112 is provided on an outer peripheral surface 111 B of the shaft 111 so as to be protruding outwardly (the outermost surface of the dilator 110 , the outermost portion).
- the spirally-arranged protruding portion 112 is provided at a distal-end side portion of the body portion 113 and at the distal end portion 115 and has gaps between adjacent portions along an axis A of the shaft 111 . That is, the adjacent portions of the spirally-arranged protruding portion 112 are spaced from each other. The gaps are configured so as to be gradually smaller toward the proximal end side from the distal end side of the shaft 111 .
- the spirally-arranged protruding portion 112 is integrally formed with the shaft 111 by casting or the like.
- the spirally-arranged protruding portion 112 protruding outwardly is provided on the outer peripheral surface 111 B of the shaft 111 and has gaps between adjacent portions along the axis A of the shaft 111 .
- This configuration enables the dilator to be advanced not only by a conventional pushing operation but also by a rotational operation of the spirally-arranged protruding portion 112 .
- the spirally-arranged protruding portion 112 is provided at a portion having an outer diameter increasing toward the proximal end side from the distal end side of the shaft, that is, at the body portion 113 . This configuration enables the diameter of a pre-formed hole to be easily increased.
- the gaps of the spirally-arranged protruding portions 112 configured so as to be gradually smaller toward the proximal end side from the distal end side of the shaft 111 can gradually change the stiffness of the shaft 111 at the axis A. This can ensure the flexibility of the distal end of the shaft 111 and can maintain the pushability and torquability of the shaft 111 even when the shaft 111 is longer and curved.
- the hollow coil body 3 , the hollow coil body 21 , the hollow coil body 31 , the hollow coil body 41 , the hollow coil body 51 , and the hollow coil body 61 are described as hollow coil bodies including 10 wires in the aforementioned embodiments, but the number of wires shall not be limited to 10. The number may be one or more.
- the coil body 22 , the coil body 42 , the coil body 52 , and the coil body 62 are described as coil bodies including 16 wires in the aforementioned embodiments, but the number of wires shall not be limited to 16. The number may be one or more.
- the coil body 23 and the coil body 33 are described as coil bodies including 23 wires in the aforementioned embodiments, but the number of wires shall not be limited to 23. The number may be one or more.
- the distal-end portion 6 is described to be formed by casting a solder material into the distal end of the multilayer body 17 .
- the outer periphery of the coil body 5 and/or the coil body 3 in the vicinity of the distal-end portion of the multilayer body 17 may be sanded to form the distal-end portion 6 having a flat surface. This also applies to the distal-end portion 66 .
- distal-end portion 6 is described as being fixed to the distal end of the multilayer body 17 .
- similar effects may be produced by fixing a distal-end portion to the distal end of the multilayer body 27 , the distal end of the multilayer body 37 , the distal end of the multilayer body 47 , the distal end of the multilayer body 77 , the distal end of the shaft 81 , the distal end of the shaft 91 , the distal end of the shaft 101 , or the distal end of the shaft 111 .
- the outer peripheries of the multilayer bodies 7 , 17 , 27 , 37 , 47 , 57 , 67 , and 77 and the shafts 81 , 91 , 101 , and 111 and the spirally-arranged protruding portions 82 , 92 , 102 , and 112 may be coated with a resin(s).
- the outer peripheries of the shaft 81 and the spirally-arranged protruding portion 82 of the dilator 80 may be coated with a resin 86 as shown in FIG. 17 .
- the resin 86 can improve slidability to prevent damage to living body tissue.
- the resin 86 When the outer periphery of the shaft 81 is coated with the resin 86 , a portion where the body portion 83 , the tapered portion 84 , and the distal-end portion 85 are coated with the resin 86 corresponds to the shaft 81 , and a portion protruding outwardly from the outer peripheral surface 81 B of the shaft 81 corresponds to the spirally-arranged protruding portion 82 .
- the resin 86 include, for example, biocompatible resin materials such as polyamide resin and fluororesin, or hydrophilic coating materials.
- the resin 86 may have a thickness of, for example, 0.1 ⁇ m to 300 ⁇ m.
- the spirally-arranged protruding portions 82 , 92 , 102 , and 112 are configured to have gaps between adjacent portions along the axis A, the gaps becoming gradually smaller toward the proximal end side from the distal end side of the shaft 81 .
- the gaps may be evenly spaced.
- the shafts 81 , 91 , 101 , and 111 and the spiral protruding portions 82 , 92 , 102 , and 112 are integrally formed but may be formed separately.
- the shaft may have various types of coating on the side of the surface thereof (including a portion between the shaft and the spirally-arranged protruding portion) other than or in addition to the resin 86 shown in FIG. 17 .
- the coating include, for example, a protective film on the surface of the shaft (representative example: a plating film), an underlying film for improving adhesiveness between the shaft and the spirally-arranged protruding portion, and the like.
- the spirally-arranged protruding portions are not configured to serve as a blade.
- the dilators are intended for expanding a hole pre-formed on a target object (for example, the wall of a digestive tract such as the patient's stomach). Therefore, if the spirally-arranged protruding portion serves as a blade, living tissue at the inner surface of the hole may be damaged.
- the spirally-arranged protruding portion preferably does not have a sharp edge at an end portion at a radially outer side of the shaft in a cross-section (for example, a cross-section perpendicular to the spiral direction of the spirally-arranged protruding portion 82 as shown in FIG. 13 ). That is, the above end portion preferably has an area having a shape including an obtuse angle or a curve (for example, a curve constituting a part of a circle or an ellipse).
- the spirally-arranged protruding portion is configured so as not to cut living tissue when dilating a hole pre-formed on a target object.
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Abstract
Description
- This application is a continuation application of International Application No. PCT/JP2018/011674, filed Mar. 23, 2018, which claims priority to International Application No. PCT/JP2017/012024, filed Mar. 24, 2017. The contents of these applications are incorporated herein by reference in their entirety.
- The present disclosure relates to a dilator.
- Conventionally, an auxiliary tool called a sheath introducer is used when a catheter is inserted into a body lumen such as a patient's blood vessel. A sheath introducer includes a sheath for connecting a patient's body lumen to the outside of the body, and a dilator to be inserted into the sheath for expanding a hole formed on a body surface. For example, Japanese Patent Application Laid-Open Publication No. 2008-11867 describes a sheath introducer 200 including a
sheath 80 and a dilator 70 (seeFIG. 1 and others). - The above sheath introducer 200 is used as follows: the patient's skin is first perforated at a predetermined location using an introducer needle, a guide wire is inserted into a body lumen such as a blood vessel through the resulting hole, a proximal end of the guide wire is inserted into a distal end of the sheath introducer 200 where the
dilator 70 is already inserted into thesheath 80, and the sheath introducer 200 is then inserted into the body lumen along the guide wire. During this, a distal end of thedilator 70 will expand the diameter of the hole formed on the skin. Subsequently, thedilator 70 is withdrawn from the sheath introducer 200, and then a catheter is inserted into the sheath introducer 200 and is inserted into a body lumen such as a blood vessel. - Such a sheath introducer is usually designed to be inserted through the patient's skin, and is generally short and linear as described in Japanese Patent Application Laid-Open Publication No. 2008-11867. Meanwhile, an alternative procedure is performed as follows: an introducer needle is pushed out of a distal end of an endoscope inserted through the patient's mouth or nose instead of through the patient's skin to perforate the wall of a digestive tract such as a patient's stomach at a predetermined location, a guide wire is inserted through the resulting hole, a proximal end of the guide wire is inserted into a distal end of a dilator, and the dilator is then inserted into the wall of the digestive tract along the guide wire to increase the diameter of the hole formed on the wall of the digestive tract.
- A dilator for use in such a procedure is designed to be inserted through the patient's mouth or nose, and thus needs to be relatively long and generally configured so as to be used in a curved state, considering that it is to be passed through the digestive tract.
- However, an increased length of a dilator may have a problem in that a rotational force (torque) and pushing force (pushability) from the user's hand cannot be transmitted to a distal end of the dilator, which in turn may preclude increasing the diameter of a hole formed on the wall of a digestive tract. In particular, a curved dilator further had a problem in that the deterioration of these properties becomes more significant.
- The disclosed embodiments have been devised in view of these circumstances. An object of the disclosed embodiments is to provide a dilator capable of easily increasing the diameter of a hole formed on the wall of a digestive tract and the like and also capable of maintaining pushability and torquability even when a shaft is longer and curved.
- In order to achieve the above object, provided is a dilator including: a hollow shaft having an outer diameter that is smaller at a distal end of the shaft than at a proximal end of the shaft; and a grip portion connected to the proximal end of the shaft, a spirally-arranged protruding portion protruding outwardly being provided on an outer peripheral surface of the shaft, and the spirally-arranged protruding portion having gaps between adjacent protruding portions along a longitudinal axis of the shaft.
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FIG. 1 show an overall view of a dilator according to the disclosed embodiments; -
FIG. 2 shows a distal end portion with a view of an inner cavity of the dilator (a multilayer body) shown inFIG. 1 ; -
FIG. 3 shows a cross-sectional view taken along line III-III inFIG. 1 ; -
FIG. 4 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments; -
FIG. 5 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments; -
FIG. 6 shows a distal end portion with a view of an inner cavity of the dilator (a multilayer body) shown inFIG. 5 ; -
FIG. 7 shows a cross-sectional view taken along line VII-VII inFIG. 5 ; -
FIG. 8 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments; -
FIG. 9 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments; -
FIG. 10 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments; -
FIG. 11 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments; -
FIG. 12 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments; -
FIG. 13 show an overall view of a dilator according to the disclosed embodiments; -
FIG. 14 shows a partial cross-sectional view of a distal-end side portion of a dilator according to the disclosed embodiments; -
FIG. 15 shows a partial cross-sectional view of a distal-end side portion of a dilator according to the disclosed embodiments; -
FIG. 16 shows a partial cross-sectional view of a distal-end side portion of a dilator according to the disclosed embodiments; -
FIG. 17 shows a distal end portion of a dilator according to the disclosed embodiments. - Below, the embodiments of the present disclosure will be described with reference to the figures. It is noted that the dimensions of the dilators shown in the figures are merely provided to facilitate understanding of the embodiments, and do not necessarily correspond to the actual dimensions.
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FIG. 1 shows an overall view of a dilator according to the disclosed embodiments,FIG. 2 shows a front end portion (distal end portion) with a view of an inner cavity of the dilator (a multilayer body), andFIG. 3 shows a cross-sectional view taken along line III-Ill inFIG. 1 . - In
FIGS. 1 and 2 , the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon. - In
FIG. 1 , a dilator 1 includes: amultilayer body 7 including ahollow coil body 3 including a plurality ofelement wires coil body 5 including asingle element wire 5 a (e.g., a metal wire) wound around a surface of thehollow coil body 3 in a direction (clockwise, facing to the distal end) opposite to the hollow coil body 3 (counterclockwise, facing to the distal end); and aconnector 9 having a hollow shape connected to a proximal end of themultilayer body 7. - Here, the
multilayer body 7 has a cylindrical hollow shape at a proximal end portion P3, has a tapered hollow shape at an intermediate portion P2, and has a cylindrical hollow shape at a distal end portion P1. - It is noted that the
wires hollow coil body 3 corresponds to the “first layer body,” the “shaft,” and the “first coil.” - In addition, the
wire 5 a corresponds to the “second wire,” and thecoil body 5 corresponds to the “second layer body,” the “spirally-arranged protruding portion,” and the “second coil.” - Further, the intermediate portion P2 of the
hollow coil body 3 corresponds to the “tapered hollow portion” and the “portion having an increasing outer diameter (tapered shape).” Further, theconnector 9 corresponds to the “grip portion.” - The
hollow coil body 3 is configured such that thewires FIG. 3 . Thehollow coil body 3 has a cylindrical hollow shape at the proximal end portion P3, has a tapered hollow shape at the intermediate portion P2, has a cylindrical hollow shape at the distal end portion P1, and has an outer diameter increasing toward a proximal end (an increasing outer diameter). That is, thehollow coil body 3 has a hollow shape having an outer diameter that is smaller at the distal end than at the proximal end. - In
FIG. 2 , the dotted lines represent the common inscribed lines of thehollow coil body 3. An inner cavity 8 is formed in the inner side of the common inscribed lines of the hollow coil body 3 (seeFIG. 3 ). - It is noted that, while wires made of stainless steel can be used as the wires of the
hollow coil body 3, they are not limited to stainless steel wires. They may be wires made of a superelastic alloy such as nickel-titanium. Further, they are not limited to metal wires and may be resin wires. - The
coil body 5 is configured such that awire 5 a (e.g., a stainless steel wire) is wound around in a direction (clockwise, facing to the distal end) opposite to the hollow coil body 3 (counterclockwise, facing to the distal end). Here, thewire 5 a is wound around closely (with a small winding pitch, for example where adjacent windings of thewire 5 a are in contact with each other) at the proximal end side and is wound around with gaps between adjacent windings at the intermediate portion P2 and the distal end portion P1. Thecoil body 5 provides a spirally-arranged protruding portion protruding outwardly (the outermost surface of the dilator 1, the outermost portion) on an outerperipheral surface 3L of thehollow coil body 3. The spirally-arranged protruding portion extends in a spiral shape along its length, and has gaps between adjacent portions (adjacent windings of thewire 5 a) along a longitudinal A of thehollow coil body 3. Further, thecoil body 5 is provided at the intermediate portion P2, which corresponds to a portion having an increasing outer diameter of thehollow coil body 3. - Further, the amount of gap (space) between adjacent windings of the
wire 5 a (i.e., the distance between adjacent windings in the longitudinal direction) is gradually decreased at the proximal end portion P3 toward the proximal end side thereof. This configuration enables the stiffness of the dilator 1 (the multilayer body 7) to be gradually changed along an axis direction (a direction of the longitudinal axis) so that the dilator 1 (multilayer body 7) can easily enter into the inside of an approach pathway even when the approach pathway meanders. - It is noted that the
wire 5 a is configured such that the amount of gap between adjacent windings of thewire 5 a is gradually decreased at the proximal end portion P3 toward the proximal end side thereof, but the configuration shall not be limited to this. Even when the amount of gap between adjacent windings of thewire 5 a is constant from the distal end portion P1 toward the proximal end portion P3, the distal-end flexibility of the dilator 1 (multilayer body 7) can be ensured, and the pushability and torquability of the dilator 1 (multilayer body 7) can be maintained in a case where the dilator 1 (multilayer body 7) is longer and curved. Further, the screw effect of thesingle wire 5 a enables the dilator 1 to be advanced not only by a pushing operation but also by a rotational operation. Further, the diameter of a pre-formed hole can easily be increased by thecoil body 5 provided at a portion where thehollow coil body 3 has an increasing outer diameter, i.e., at the intermediate portion P2. - Further, with regard to the
wire 5 a, the amount of gap between adjacent windings of thewire 5 a is gradually decreased at the proximal end portion P3 toward the proximal end side thereof. This configuration can have the following effect: the stiffness of the dilator 1 (the multilayer body 7) in the axis direction can be gradually changed so that the dilator 1 (multilayer body 7) can easily enter into the inside of an approach pathway even when the approach pathway meanders. - Further, a shaft composed of the hollow coil body 3 (the first coil) including a plurality of wires wound around into a hollow shape can improve the flexibility of the shaft and the transmissibility of torque via the shaft. Further, a spirally-arranged protruding portion composed of the coil body 5 (the second coil) including the
single wire 5 a wound around on the outerperipheral surface 3L of thehollow coil body 3 can easily be formed, can ensure the flexibility of the distal end of the dilator 1, and can improve the torquability by virtue of the elasticity of the second coil. Further, each wire of thehollow coil body 3 is wound around in a direction opposite to thewire 5 a of thecoil body 5. Therefore, even when the dilator 1 is rotated in a direction to open thehollow coil body 3, a force is applied in a direction to close thecoil body 5 to prevent the opening of thehollow coil body 3. This allows a force applied to theconnector 9 of the dilator 1 to be transmitted to the distal end side. - It is noted that the
wire 5 a can be made of stainless steel, but the material shall not be limited to stainless steel. A metal wire made of a superelastic alloy such as nickel-titanium may be used. Further, it shall not be limited to a metal wire, and a resin wire may be used. - The length of the dilator is, for example, 2000 mm, preferably 1600 mm to 2500 mm; the length of the distal end portion P1 is, for example, 10 mm, preferably 0 mm to 100 mm; and the length of the intermediate portion P2 is, for example, 30 mm, preferably 5 mm to 100 mm. The inner diameter of the
hollow coil body 3 at the distal end is, for example, 0.7 mm, preferably 0.4 mm to 1.0 mm, and the inner diameter of thehollow coil body 3 at the proximal end is, for example, 1.5 mm, preferably 1.0 mm to 3.0 mm. The outer diameter of thecoil body 5 at the distal end is, for example, 1.84 mm, preferably 0.8 mm to 3.0 mm, and the outer diameter of thecoil body 5 at the proximal end is, for example, 2.64 mm, preferably 1.4 mm to 5.0 mm. Further, the diameters of thewires 3 a to 3 h and 3 j to 3 k are, for example, 0.21 mm, preferably 0.1 mm to 0.5 mm, and the diameter of thewire 5 a is, for example, 0.36 mm, preferably 0.1 mm to 0.5 mm. - The distal end of the
connector 9 is connected to the proximal end of thehollow coil body 3 and the proximal end of thecoil body 5. Theconnector 9 is made of a resin and has a hollow shape which has an inner cavity communicating with the inner cavity 8 of thehollow coil body 3. - Next, an example of an operating mode of the above dilator will be described.
- First, a target object is punctured using an introducer needle. After the puncture, a guide wire is inserted through an inner cavity of the introducer needle, and the introducer needle is withdrawn thereafter. Then, the distal end of the dilator 1 is inserted from the proximal end of the guide wire into the punctured portion. Subsequently, the diameter of a hole at the punctured portion can be increased by pushing and rotating the dilator 1 inward.
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FIG. 4 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments. InFIG. 4 , the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon. - It is noted that the dilator in
FIG. 4 basically has the same structure as the dilator 1 inFIGS. 1-3 . Therefore, the same number is given to the same member, and a detailed description will be omitted. - In
FIG. 4 , adilator 10 includes: amultilayer body 17 including thehollow coil body 3 including the plurality ofwires coil body 5 including thesingle wire 5 a wound around the surface of thehollow coil body 3 in a direction (clockwise, facing to the distal end) opposite to the hollow coil body 3 (counterclockwise, facing to the distal end); and aconnector 9 having a hollow shape and being connected to the proximal end of themultilayer body 17. However, thedilator 10 differs from the dilator 1 in that themultilayer body 17 of thedilator 10 has a distal-end portion 6 at the distal end of thehollow coil body 3 while themultilayer body 7 of the dilator 1 does not. Thehollow coil body 3 having the distal-end portion 6 provided at the distal end corresponds to the “shaft.” - The distal-end portion 6 is formed by casting a solder material (a silver-tin solder material, a gold-tin solder material, or the like) into the distal end of the
hollow coil body 3 and has a substantially cylindrical hollow shape. Further, the surface of the distal-end portion 6 is flat (smooth) while the surface of the distal end of themultilayer body 7 is uneven. - The
dilator 10 having the aforementioned configuration in which the distal-end portion 6 having a flat surface is connected to the distal end of themultilayer body 17 can further improve insertability into a punctured portion by first pressing the dilator against the punctured portion, and then pushing and rotating the dilator thereinto. -
FIG. 5 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments,FIG. 6 shows the distal end portion with a view of an inner cavity of the dilator, andFIG. 7 shows a cross-sectional view taken along line VII-VII inFIG. 5 . - In
FIGS. 5 and 6 , the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon. - In
FIG. 5 , a dilator 20 includes: a multilayer body 27 including a hollow coil body 21 including a plurality of wires 21 a, 21 b, 21 c, 21 d, 21 e, 21 f, 21 g, 21 h, 21 j, and 21 k wound around into a hollow shape; a coil body 22 proximally spaced from a distal end of the hollow coil body 21 and including a plurality of wires 22 a, 22 b, 22 c, 22 d, 22 e, 22 f, 22 g, 22 h, 22 j, 22 k, 22 m, 22 n, 22 p, 22 q, 22 r, and 22 s wound around on an outer periphery of the hollow coil body 21 in the same direction (counterclockwise, facing to the distal end) as the hollow coil body 21; a coil body 23 proximally spaced from a distal end of the coil body 22 and including a plurality of wires 23 a (only one of the wires 23 a is indicated by a reference number inFIGS. 5 and 6 ) wound around on an outer periphery of the coil body 22 in a direction (clockwise, facing to the distal end) opposite to the coil body 22 (counterclockwise, facing to the distal end); a coil body 25 including a single wire 25 a wound around with gaps between adjacent windings on the outer periphery of the coil body 22 in a region distal to a distal end of the coil body 23; and a coil body 24 including a single wire 24 a wound around (in the same direction as the wire 25 a) with gaps between adjacent windings on the outer periphery of the coil body 21 in a region distal to a distal end of the coil body 22. Thedilator 20 further includes a connector 9 (not shown) having a hollow shape and connected to a proximal end of themultilayer body 27. - Here, the
multilayer body 27 has a cylindrical hollow shape at the proximal end side of the proximal end portion P3 as in themultilayer body 7 and themultilayer body 17. However, themultilayer body 27 has a stepped and cylindrical hollow shape in the vicinity of the distal end and intermediate portions while themultilayer body 7 and themultilayer body 17 have intermediate portions with tapered shapes. - It is noted that the
wires hollow coil body 21 corresponds to the “third layer body.” - Further, the
wires 22 a. 22 b, 22 c, 22 d, 22 e, 22 f, 22 g, 22 h, 22 j, 22 k, 22 m, 22 n, 22 p, 22 q, 22 r, and 22 s corresponds to the “fourth wires,” and thecoil body 22 corresponds to the “fourth layer body” and the “portion having an increasing outer diameter.” - Further, the
wire 24 a corresponds to the “fifth wire,” and thecoil body 24 corresponds to the “fifth layer body.” - Further, the
wires 23 a correspond to the “sixth wires,” and thecoil body 23 corresponds to the “sixth layer body.” - Further, the
wire 25 a corresponds to the “seventh wire,” and thehollow coil body 25 corresponds to the “seventh layer body.” - The
hollow coil body 21 and thecoil body 22 together correspond to the “shaft” and the “first coil.” Thecoil body 24 and thecoil body 25 together correspond to the “spirally-arranged protruding portion” and the “second coil.” - The
hollow coil body 21 is configured such that thewires FIG. 7 . Thehollow coil body 21 has a cylindrical hollow shape from the distal end to theconnector 9. - In
FIG. 6 , the dotted line (the innermost among the three dotted lines) represents the common inscribed line of thehollow coil body 21. Aninner cavity 28 is formed in the inner side of the common inscribed line of the hollow coil body 21 (seeFIG. 7 ). - Further, the
coil body 22 is formed such that thewires coil body 21 as shown inFIG. 7 . Thecoil body 22 also has a cylindrical hollow shape from the distal end to theconnector 9. - In
FIG. 6 , the dotted line (the intermediate among the three dotted lines) represents the common inscribed line of thecoil body 22. - Further, the
coil body 23 is formed such that thewires 23 a are 23 wires (e.g., stainless steel wires) that are twisted on a surface of thecoil body 22. Thecoil body 23 also has a cylindrical hollow shape from the distal end to theconnector 9. - In
FIG. 6 , the dotted line (the outermost among the three dotted lines) represents the common inscribed line of thehollow coil body 23. Thecoil body 22 is twistedly formed on the surface of thehollow coil body 21. This means that the shaft formed from thehollow coil body 21 and thecoil body 22 has a hollow shape and an outer diameter that is smaller at a distal end than at a proximal end. - Further, the
coil body 24 is formed such that thewire 24 a (e.g., a stainless steel wire) is wound on the surface of thecoil body 21, and thecoil body 25 is formed such that thewire 25 a (e.g., a stainless steel wire) is wound on the surface of thecoil body 22. - Each element wire in the
hollow coil body 21, thecoil body 22, and thecoil body 23 is wound around closely, and in thecoil body 24 and thecoil body 25, a wire is wound around with gaps between adjacent windings (seeFIG. 6 ). Thecoil body 24 provides a spirally-arranged protruding portion protruding outwardly (the outermost surface of thedilator 20, the outermost portion) on an outerperipheral surface 21L of thehollow coil body 21, and thecoil body 25 provides a spirally-arranged protruding portion protruding outwardly (the outermost surface of thedilator 20, the outermost portion) on an outerperipheral surface 22T of thecoil body 22. The spirally-arranged protruding portion has gaps between adjacent portions (adjacent portions of the wire) along an axis A of thehollow coil body 21. Further, thecoil body 25 is provided on thecoil body 22 as a portion in which the shaft has an increasing outer diameter. - It is noted that metal wires made of stainless steel can be used for the wires of the
hollow coil body 21, thecoil body 22, thecoil body 23, thecoil body 24, and thecoil body 25, but they are not limited to stainless steel wires. They may be made of a superelastic alloy such as nickel-titanium. Further, they are not limited to metal wires and may be resin wires. - The dilator 20 (the multilayer body 27) can ensure the distal-end flexibility of the dilator 20 (the multilayer body 27) and can maintain the pushability and torquability of the dilator 20 (the multilayer body 27) even when the dilator 20 (the multilayer body 27) is longer and curved. Further, the screw effect of the
single wire 24 a and thesingle wire 25 a enables thedilator 20 to be advanced not only by a pushing operation but also by a rotational operation. Further, the diameter of a pre-formed hole can easily be increased by thecoil body 25 provided at thecoil body 22 which corresponds to a portion where the shaft has an increasing outer diameter. - It is noted that when the amounts of gap between adjacent windings of the
wire 25 a and thewire 24 a are configured so as to be gradually reduced toward the proximal end side, the following effect can be observed: the stiffness of the dilator 20 (the multilayer body 27) along the axis direction can be gradually changed so that the dilator 20 (the multilayer body 27) can easily enter into the inside of an approach pathway even when the approach pathway meanders. - Further, the shaft (the first coil) composed of the
hollow coil body 21 and thecoil body 22 each including a plurality of wires wound around into a hollow shape can improve the flexibility of the shaft and the transmissibility of torque via the shaft. Further, the spirally-arranged protruding portion (the second coil) composed of thecoil body 24 including a single wire wound around on the outerperipheral surface 21L of thehollow coil body 21 and thecoil body 25 wound around on the outerperipheral surface 22T of thecoil body 22 can be easily formed, can ensure the flexibility of the distal end of thedilator 20 by virtue of the elasticity of the second coil, and can improve the torquability. Further, the wires of thehollow coil body 21 and thecoil body 22 are wound in a direction opposite to the wires of thecoil body 24 and thecoil body 25. Therefore, even when thedilator 20 is rotated in a direction to open thehollow coil body 21 and thecoil body 22, a force is applied in a direction to close thecoil body 24 and thecoil body 25 to prevent the opening of thehollow coil body 21 and thecoil body 22. This allows a force applied to theconnector 9 of thedilator 20 to be transmitted to the distal end side. -
FIG. 8 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments. InFIG. 8 , the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon. - In
FIG. 8 , a dilator 30 includes: a multilayer body 37 including a hollow coil body 31 including a plurality of wires 31 a, 31 b, 31 c, 31 d, 31 e, 31 f, 31 g, 31 h, 31 j, and 31 k wound around into a hollow shape; a coil body 32 including a single wire 32 a wound around on an outer periphery of the hollow coil body 31 from a distal end of the hollow coil body 31 in a direction (clockwise, facing to the distal end) opposite to the hollow coil body 31; a coil body 33 proximally spaced from a distal end of the coil body 32 and including a plurality of wires 33 a (only one of the wires 33 a is indicated by the reference number inFIG. 8 ) wound around on an outer periphery of the coil body 32 in a direction (counterclockwise, facing to the distal end) opposite to the coil body 32 (clockwise, facing to the distal end); and a coil body 35 including a single wire 35 a wound around with gaps between adjacent windings on the outer periphery of the coil body 32 in a region distal to a distal end of the coil body 33 in the same direction (clockwise, facing to the distal end) as the coil body 32 (clockwise, facing to the distal end). Thedilator 30 further includes a connector 9 (not shown) having a hollow shape and being connected to a proximal end of themultilayer body 37. - Here, the
multilayer body 37 has a stepped and cylindrical hollow shape as in themultilayer body 27, but it differs from themultilayer body 27 in that thecoil body 32 in themultilayer body 37 is formed integrally and continuously while thecoil body 22 and thecoil body 24 in themultilayer body 27 are formed as separate members. That is, in thecoil body 32, thewire 32 a is wound around closely at the proximal end side while wound around with gaps between adjacent windings at the distal end side as shown inFIG. 8 . - It is noted that the
hollow coil body 31 and a portion of thecoil body 32 where thewire 32 a is wound around closely together correspond to the “shaft” and the “first coil.” Thecoil body 35 and the portion of thecoil body 32 where thewire 32 a is wound around with gaps between adjacent windings together correspond to the “spirally-arranged protruding portion” and the “second coil.” Further, the portion of thecoil body 32 where thewire 32 a is wound around closely corresponds to the “portion having an increasing outer diameter.” - The
hollow coil body 31 is formed such that thewires hollow coil body 21. Thehollow coil body 31 has a cylindrical hollow shape from the distal end to theconnector 9. - Further, the
coil body 32 is formed such that thewire 32 a (e.g., a stainless steel wire) is wound around a surface of thecoil body 31. Thecoil body 32 also has a cylindrical hollow shape from the distal end to theconnector 9. - Further, the
coil body 33 is formed such that thewires 33 a are 23 wires (e.g., stainless steel wires) that are twisted on a surface of thecoil body 32. Thehollow coil body 33 also has a cylindrical hollow shape from the distal end to theconnector 9. A closely wound portion of thecoil body 32 is twistedly formed on the surface of thehollow coil body 31. This means that the shaft formed from thehollow coil body 31 and the closely wound portion of thecoil body 32 has a hollow shape having an outer diameter that is smaller at a distal end than at a proximal end. - Further, the
coil body 35 is formed such that thewire 35 a (e.g., a stainless steel wire) is formed on the surface of thecoil body 32. - Each wire in the
hollow coil body 31 and thecoil body 33 is wound around closely (seeFIG. 8 ). The portion of thecoil body 32 where the wire is wound around with gaps between adjacent windings provides a spirally-arranged protruding portion protruding outwardly (the outermost surface of thedilator 30, the outermost portion) on an outerperipheral surface 31L of thehollow coil body 31, and thecoil body 35 provides a spirally-arranged protruding portion protruding outwardly (the outermost surface of thedilator 30, the outermost portion) on an outerperipheral surface 32B of the closely wound portion of thecoil body 32. These spirally-arranged protruding portions each have gaps between adjacent portions (adjacent windings of the wire) along an axis A of thehollow coil body 31. Further, thecoil body 35 is provided at the closely wound portion of thecoil body 32, which corresponds to a portion where the shaft has an increasing outer diameter. - It is noted that metal wires made of stainless steel can be used for the wires of the
hollow coil body 31, thecoil body 32, thecoil body 33, and thecoil body 35, but they are not limited to stainless steel wires. They may be those made of a superelastic alloy such as nickel-titanium. Further, they are not limited to metal wires and may be resin wires. - The dilator 30 (the multilayer body 37) can ensure the distal-end flexibility of the dilator 30 (the multilayer body 37) and can maintain the pushability and torquability of the dilator 30 (the multilayer body 37) even when the dilator 30 (the multilayer body 37) is longer and curved. Further, the screw effect of the
single wire 32 a and thesingle wire 35 a extending contiguously toward the distal end from the proximal end of thecoil body 32 can further be improved when themultilayer body 37 is rotated. This enables thedilator 30 to be easily advanced not only by a pushing operation but also by a rotational operation. In addition, thecoil body 35 is provided in the closely wound portion of thecoil body 32, which corresponds to a portion where the shaft has an increasing outer diameter. Therefore, the diameter of a pre-formed hole can be increased more easily. - It is noted that when the amounts of gap between adjacent windings of the
wire 32 a and thewire 35 a are configured so as to be gradually reduced toward the proximal end side, the following effect can be observed: the stiffness of the dilator 30 (the multilayer body 37) along the axis direction can be gradually changed so that the dilator 30 (the multilayer body 37) can easily enter into the inside of an approach pathway even when the approach pathway meanders. - Further, a shaft (the first coil) composed of the
hollow coil body 31 including a plurality of wires wound around into a hollow shape, and thecoil body 32 can improve the flexibility of the shaft and the transmissibility of torque via the shaft. Further, a spirally-arranged protruding portion (the second coil) composed of thecoil body 32 including a single wire wound around the outerperipheral surface 31L of thehollow coil body 31 and thecoil body 35 wound around the outerperipheral surface 32B of thecoil body 32 can be easily formed, can ensure the flexibility of the distal end of thedilator 30 by virtue of the elasticity of the second coil, and can improve the torquability. Further, the wires of thehollow coil body 31 are wound in a direction opposite to the wires of thecoil body 32 and thecoil body 35. Therefore, even when thedilator 30 is rotated in a direction to open thehollow coil body 31, a force is applied in a direction to close thecoil body 32 and thecoil body 35 to prevent the opening of thehollow coil body 31. This allows a force applied to theconnector 9 of thedilator 30 to be transmitted to the distal end side. -
FIG. 9 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments. - In
FIG. 9 , the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon. - In
FIG. 9 , a dilator 40 includes: a multilayer body 47 including a hollow coil body 41 including a plurality of wires 41 a, 41 b, 41 c, 41 d, 41 e, 41 f, 41 g, 41 h, 41 j, and 41 k wound around into a hollow shape; a coil body 42 proximally spaced from a distal end of the hollow coil body 41 and including a plurality of wires 42 a, 42 b, 42 c, 42 d, 42 e, 42 f, 42 g, 42 h, 42 j, 42 k, 42 m, 42 n, 42 p, 42 q, 42 r, and 42 s wound around on an outer periphery of the hollow coil body 41 in the same direction (counterclockwise, facing to the distal end) as the hollow coil body 21 (counterclockwise, facing to the distal end); a coil body 43 including a single wire 43 a wound around on an outer periphery of the coil body 42 from a distal end of the coil body 42 in a direction (clockwise, facing to the distal end) opposite to the coil body 42; and a coil body 44 including a single wire 44 a wound around with gaps between adjacent windings on the outer periphery of the coil body 41 in a region distal to a distal end of the coil body 42 in the same direction (clockwise, facing to the distal end) as the coil body 43 (clockwise, facing to the distal end). Thedilator 40 further includes a connector 9 (not shown) having a hollow shape and connected to a proximal end of themultilayer body 47. - Here, the
multilayer body 47 has a stepped and cylindrical hollow shape as in themultilayer body 27, but it differs from themultilayer body 27 in that thecoil body 43 in themultilayer body 47 is formed integrally and continuously while thecoil body 25 and thecoil body 23 in themultilayer body 27 are formed as separate members. That is, in thecoil body 43, thewire 43 a is wound around closely at the proximal end side while wound around with gaps between adjacent windings at the distal end side as shown inFIG. 9 . - It is noted that the
hollow coil body 41 and thecoil body 42 together correspond to the “shaft” and the “first coil.” A portion of thecoil body 43 wound around closely and thecoil body 44 together correspond to the “spirally-arranged protruding portion” and the “second coil.” Further, thecoil body 42 corresponds to the “portion having an increasing outer diameter.” - The
hollow coil body 41 is formed such that thewires hollow coil body 21. Thehollow coil body 41 has a cylindrical hollow shape from the distal end to theconnector 9. - Further, the
coil body 42 is formed such that thewires coil body 41 in the same direction (counterclockwise, facing to the distal end) as thehollow coil body 41. Thecoil body 42 also has a cylindrical hollow shape from the distal end to theconnector 9. - Further, the
coil body 43 is formed such that thewire 43 a (e.g., a stainless steel wire) is wound around on a surface of thecoil body 42. Thehollow coil body 43 also has a cylindrical hollow shape from the distal end to theconnector 9. - Further, the
coil body 44 is formed such that thewire 44 a (e.g., a stainless steel wire) is wound around the surface of thecoil body 41 in the same direction (clockwise, facing to the distal end) as the coil body 43 (clockwise, facing to the distal end). - Each wire in the
hollow coil body 41 and thecoil body 42 is wound around closely (seeFIG. 9 ). Thecoil body 42 is twistedly formed on the surface of thehollow coil body 41. This means that the shaft formed by thehollow coil body 41 and thecoil body 42 has a hollow shape having an outer diameter that is smaller at a distal end than at a proximal end. Thecoil body 44 provides a spirally-arranged protruding portion protruding outwardly (the outermost surface of thedilator 40, the outermost portion) on an outerperipheral surface 41L of thehollow coil body 41, and thecoil body 43 provides a spirally-arranged protruding portion protruding outwardly (the outermost surface of thedilator 40, the outermost portion) on an outerperipheral surface 42T of thecoil body 42. These spirally-arranged protruding portions each have gaps between adjacent portions (adjacent windings of the wire) along an axis A of thehollow coil body 41. Further, thecoil body 43 is provided on thecoil body 42, which corresponds to a portion where the shaft has an increasing outer diameter. - It is noted that metal wires made of stainless steel can be used for the wires of the
hollow coil body 41, thecoil body 42, thecoil body 43, and thecoil body 44, but they are not limited to stainless steel wires. They may be made of a superelastic alloy such as nickel-titanium. Further, they are not limited to metal wires and may be resin wires. - The dilator 40 (the multilayer body 47) can ensure the distal-end flexibility of the dilator 40 (the multilayer body 47) and can maintain the pushability and torquability of the dilator 40 (the multilayer body 47) even when the dilator 40 (the multilayer body 47) is longer and curved. Further, the screw effect of the
single wire 43 a and thesingle wire 44 a extending contiguously toward the distal end from the proximal end of thecoil body 43 can further be improved when themultilayer body 47 is rotated. This enables thedilator 40 to be easily advanced not only by a pushing operation but also by a rotational operation. In addition, the diameter of a pre-formed hole can be increased more easily by thecoil body 43 provided at thecoil body 42 which corresponds to a portion where the shaft has an increasing outer diameter. - It is noted that when the amounts of gap between adjacent windings of the
wire 44 a and thewire 43 a are configured so as to be gradually reduced toward the proximal end side, the following effect can be observed: the stiffness of the dilator 40 (the multilayer body 47) along the axis direction can be gradually changed so that the dilator 40 (the multilayer body 47) can easily enter into the inside of an approach pathway even when the approach pathway meanders. - Further, a shaft (the first coil) composed of the
hollow coil body 41 and thecoil body 42 each including a plurality of wires wound around into a hollow shape can improve the flexibility of the shaft and the transmissibility of torque via the shaft. Further, a spirally-arranged protruding portion (the second coil) composed of thecoil body 44 including a single wire wound around on the outerperipheral surface 41L of thehollow coil body 41 and thecoil body 43 wound around on an outerperipheral surface 42T of thecoil body 42 can be easily formed, can ensure the flexibility of the distal end of thedilator 40 by virtue of the elasticity of the second coil, and can improve the torquability. Further, of the wires of thehollow coil body 41 and thecoil body 42 are wound in a direction opposite to the wires of thecoil body 43 and thecoil body 44. Therefore, even when thedilator 40 is rotated in a direction to open thehollow coil body 41 and thecoil body 42, a force is applied in a direction to close thecoil body 43 and thecoil body 44 to prevent the opening of thehollow coil body 41 and thecoil body 42. This allows a force applied to theconnector 9 of thedilator 40 to be transmitted to the distal end side. -
FIG. 10 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments. - In
FIG. 10 , the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon. - In
FIG. 10 , adilator 50 includes: amultilayer body 57 including ahollow coil body 51 including a plurality ofwires coil body 52 proximally spaced from a distal end of thehollow coil body 51 and including a plurality ofelement wires hollow coil body 51 in the same direction (counterclockwise, facing to the distal end) as the hollow coil body 51 (counterclockwise, facing to the distal end); and acoil body 53 including asingle wire 53 a wound around on the outer peripheries of thehollow coil body 51 and thecoil body 52 from the distal end of thehollow coil body 51 in a direction (clockwise, facing to the distal end) opposite to thehollow coil body 52. Thedilator 50 further includes a connector 9 (not shown) having a hollow shape and connected to a proximal end of themultilayer body 57. - Here, the
multilayer body 57 has a stepped and cylindrical hollow shape as in themultilayer body 27, but it differs from themultilayer body 27 in that thecoil body 53 in themultilayer body 57 is formed integrally and continuously while thecoil body 24, thecoil body 25, and thecoil body 23 in themultilayer body 27 are formed as separate members. That is, in thecoil body 53, thesingle wire 53 a is wound around closely at the proximal end side and wound around with gaps between adjacent windings at the distal end side of thecoil body 52 and the distal end side of thecoil body 51. - It is noted that the
hollow coil body 51 and thecoil body 52 together correspond to the “shaft” and the “first coil.” The portion of thecoil body 53 wound around with gaps between adjacent windings corresponds to the “spirally-arranged protruding portion” and the “second coil.” Further, thecoil body 52 corresponds to the “portion having an increasing outer diameter.” - The
hollow coil body 51 is formed such that thewires hollow coil body 21. Thehollow coil body 51 has a cylindrical hollow shape from the distal end to theconnector 9. - Further, the
coil body 52 is formed such that thewires coil body 51 in the same direction (counterclockwise, facing to the distal end) as thehollow coil body 51. Thecoil body 52 also has a cylindrical hollow shape from the distal end to theconnector 9. - Further, the
coil body 53 is formed such that thewire 53 a (e.g., a stainless steel wire) is wound around on the surfaces of thecoil body 51 and thecoil body 52. Thehollow coil body 53 also has a cylindrical hollow shape from the distal end to theconnector 9. - Each wire in the
hollow coil body 51 and thecoil body 52 is wound around closely (seeFIG. 10 ). Thecoil body 52 is twistedly formed on the surface of thehollow coil body 51. This means that thehollow coil body 51, thecoil body 52, and the closely wound portion of thecoil body 53 collectively correspond to the shaft having a hollow shape with an outer diameter that is smaller at a distal end than at a proximal end. Thecoil body 53 provides a spirally-arranged protruding portion protruding outwardly (from the outermost surface and the outermost portion of the dilator 50) on an outerperipheral surface 51L of thehollow coil body 51 and an outerperipheral surface 52T of thecoil body 52. The above spirally-arranged protruding portion has gaps between adjacent portions (adjacent windings of the wire) along an axis A of thehollow coil body 51. Further, thecoil body 53 is provided at thecoil body 52, which corresponds to a portion where the shaft has an increasing outer diameter. - It is noted that metal wires made of stainless steel can be used for the wires of the
hollow coil body 51, thecoil body 52, and thecoil body 53, but they are not limited to stainless steel wires. They may be made of a superelastic alloy such as nickel-titanium. Further, they are not limited to metal wires and may be resin wires. - The dilator 50 (the multilayer body 57) can ensure the distal-end flexibility of the dilator 50 (the multilayer body 57) and can maintain the pushability and torquability of the dilator 50 (the multilayer body 57) even when the dilator 50 (the multilayer body 57) is longer and curved. Further, the screw effect of the
single wire 53 a extending contiguously toward the distal end from the proximal end of thecoil body 53 can further be improved when themultilayer body 57 is rotated. This enables thedilator 50 to be easily advanced not only by a pushing operation but also by a rotational operation. In addition, the diameter of a pre-formed hole can be increased more easily by thecoil body 53 provided at thecoil body 52 which corresponds to a portion where the shaft has an increasing outer diameter. - It is noted that when the amount of gap between adjacent windings of the
metal wire 53 a is configured so as to be gradually reduced toward the proximal end side, the following effect can be observed: the stiffness of the dilator 50 (the multilayer body 57) along the axis direction can be gradually changed so that the dilator 50 (the multilayer body 57) can easily enter into the inside of an approach pathway even when the approach pathway meanders. - Further, a shaft (the first coil) composed of the
hollow coil body 51 and thecoil body 52 each including a plurality of wires wound around into a hollow shape can improve the flexibility of the shaft and the transmissibility of torque via the shaft. Further, a spirally-arranged protruding portion (the second coil) composed of thecoil body 53 including a single wire wound around the outerperipheral surface 51L of thehollow coil body 51 and the outerperipheral surface 52T of thehollow coil body 52 can be easily formed, can ensure the flexibility of the distal end of thedilator 50 by virtue of the elasticity of the second coil, and can improve the torquability. Further, the wires of thehollow coil body 51 and thecoil body 52 are wound in a direction opposite to the wire of thecoil body 53. Therefore, even when thedilator 50 is rotated in a direction to open thehollow coil body 51 and thecoil body 52, a force is applied in a direction to close thecoil body 53 to prevent the opening of thehollow coil body 51 and thecoil body 52. This allows a force applied to theconnector 9 of thedilator 50 to be transmitted to the distal end side. -
FIG. 11 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments. - In
FIG. 11 , the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon. - In
FIG. 11 , adilator 60 includes: amultilayer body 67 including ahollow coil body 61 including a plurality ofwires coil body 62 proximally spaced from a distal end of thehollow coil body 61 and including a plurality ofwires hollow coil body 61 in the same direction (counterclockwise, facing to the distal end) as the hollow coil body 61 (counterclockwise, facing to the distal end); and acoil body 63 including asingle wire 63 a wound around on the outer peripheries of thehollow coil body 61 and thecoil body 62 from the distal end of thehollow coil body 61 in a direction (clockwise, facing to the distal end) opposite to thehollow coil body 62. Thedilator 60 further includes a connector 9 (not shown) having a hollow shape and being connected to a proximal end of themultilayer body 67. However, thedilator 60 differs from thedilator 50 in that themultilayer body 67 of thedilator 60 has a distal-end portion 66 at the distal end of thehollow coil body 61 while themultilayer body 57 of thedilator 50 does not. - The distal-
end portion 66 is formed by casting a solder material (a silver-tin solder material, a gold-tin solder material, or the like) into the distal end of thehollow coil body 61, and has a substantially cylindrical hollow shape. Further, the surface of the distal-end portion 66 is flat while the surface of the distal end of themultilayer body 57 is uneven. - The
multilayer body 67 has a stepped and cylindrical hollow shape as in themultilayer body 27, but it differs from themultilayer body 27 in that thecoil body 63 in themultilayer body 67 is formed integrally and continuously while thecoil body 24, thecoil body 25, and thecoil body 23 in themultilayer body 27 are formed as separate members. That is, in thecoil body 63, thesingle wire 63 a is closely wound around at the proximal end side and is wound around with gaps between adjacent windings at the distal end side of thecoil body 62 and the distal end side of thecoil body 61. - It is noted that the
hollow coil body 61 and thecoil body 62 together correspond to the “shaft” and the “first coil.” The portion of thecoil body 63 wound around with gaps between adjacent windings corresponds to the “spirally-arranged protruding portion” and the “second coil.” Further, thecoil body 62 corresponds to the “portion having an increasing outer diameter.” - The
hollow coil body 61 is formed such that thewires hollow coil body 21. Thehollow coil body 61 has a cylindrical hollow shape from the distal end to theconnector 9. - Further, the
coil body 62 is formed such that thewires coil body 61 in the same direction (counterclockwise, facing to the distal end) as thehollow coil body 61. Thehollow coil body 62 also has a cylindrical hollow shape from the distal end to theconnector 9. - Further, the
coil body 63 is formed such that thewire 63 a (e.g., a stainless steel wire) is wound around on the surfaces of thecoil body 61 and thecoil body 62. Thehollow coil body 63 also has a cylindrical hollow shape from the distal end to theconnector 9. - Each wire in the
hollow coil body 61 and thecoil body 62 is wound around closely (seeFIG. 11 ). Thecoil body 62 is twistedly formed on the surface of thehollow coil body 61. This means that the shaft formed from thehollow coil body 61 and thecoil body 62 has a hollow shape having an outer diameter that is smaller at a distal end than at a proximal end. Thecoil body 63 provides a spirally-arranged protruding portion protruding outwardly (the outermost surface of thedilator 60, the outermost portion) on an outerperipheral surface 61L of thehollow coil body 61 and an outerperipheral surface 62T of thecoil body 62. The above spirally-arranged protruding portion has gaps between adjacent portions (adjacent windings of the wire) along an axis A of thehollow coil body 61. Further, thecoil body 63 is provided at thecoil body 62 which corresponds to a portion where the shaft has an increasing outer diameter. - It is noted that metal wires made of stainless steel can be used for the wires of the
hollow coil body 61, thecoil body 62, and thecoil body 63, but they are not limited to stainless steel wires. They may be made of a superelastic alloy such as nickel-titanium. Further, they are not limited to metal wires and may be resin wires. - According to the dilator 60 (the multilayer body 67), the distal-
end portion 66 having a flat surface is connected to the distal end of themultilayer body 67. This configuration can further improve insertability into a punctured portion by first pressing the dilator against the punctured portion, and then pushing and rotating the dilator inward. In addition, this configuration can ensure the distal-end flexibility of the dilator 60 (the multilayer body 67) and can improve the pushability and torquability of the dilator 60 (the multilayer body 67) even when the dilator 60 (the multilayer body 67) is longer and curved. Further, the screw effect of thesingle wire 63 a extending contiguously toward the distal end from the proximal end of thecoil body 63 can further be improved when themultilayer body 67 is rotated. This enables thedilator 60 to be easily advanced not only by a pushing operation but also by a rotational operation. In addition, the diameter of a pre-formed hole can be increased more easily by thecoil body 63 provided at thecoil body 62 which corresponds to a portion where the shaft has an increasing outer diameter. - It is noted that when the amount of gap between adjacent windings of the
metal wire 63 a is configured so as to be gradually reduced toward the proximal end side, the following effect can be observed: the stiffness of the dilator 60 (the multilayer body 67) along the axis direction can be gradually changed so that the dilator 60 (the multilayer body 67) can easily enter into the inside of an approach pathway even when the approach pathway meanders. - Further, the shaft (the first coil) composed of the
hollow coil body 61 and thecoil body 62 each including a plurality of wires wound around into a hollow shape can improve the flexibility of the shaft and the transmissibility of torque via the shaft. Further, a spirally-arranged protruding portion (the second coil) composed of thecoil body 63 including a single wire wound around on an outerperipheral surface 61L of thehollow coil body 61 and an outerperipheral surface 62T of thehollow coil body 62 can be easily formed, can ensure the flexibility of the distal end of thedilator 60 by virtue of the elasticity of the second coil, and can improve the torquability. Further, the wires of thehollow coil body 61 and thecoil body 62 are wound in a direction opposite to the wire of thecoil body 63. Therefore, even when thedilator 60 is rotated in a direction to open thehollow coil body 61 and thecoil body 62, a force is applied in a direction to close thecoil body 63 to prevent the opening of thehollow coil body 61 and thecoil body 62. This allows a force applied to theconnector 9 of thedilator 60 to be transmitted to the distal end side. -
FIG. 12 shows a distal end portion of a dilator (a multilayer body) according to the disclosed embodiments. - In
FIG. 12 , the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon. - In
FIG. 12 , adilator 70 includes: amultilayer body 77 including ahollow coil body 21 including a plurality ofwires coil body 22 proximally spaced from a distal end of thehollow coil body 21 and including a plurality ofwires hollow coil body 21 in a direction (clockwise, facing to the distal end) opposite to thehollow coil body 21; and acoil body 24 including asingle wire 24 a wound around with gaps between adjacent windings on the outer periphery of thecoil body 21 in a region distal to a distal end of thecoil body 22. Thedilator 70 further includes a connector 9 (not shown) having a hollow shape and being connected to a proximal end of themultilayer body 77. - Here, the
multilayer body 77 has a stepped and cylindrical hollow shape as in themultilayer body 27 but has a two-layer structure where thecoil 25 and thecoil 23 are removed from themultilayer body 27. - Even in a case where the dilator 70 (the multilayer body 77) is longer and curved, the dilator 70 (the multilayer body 77) can ensure the distal-end flexibility of the dilator 70 (the multilayer body 77), can maintain the pushability and torquability of the dilator 70 (the multilayer body 77), and can enable the diameter of a pre-formed hole to be easily increased by the screw effect of the
wire 24 a upon rotation of themultilayer body 77. - However, the
multilayer body 77 has a two-layer structure while themultilayer body 27 has a three-layer structure. Therefore, themultilayer body 77 may have a somewhat inferior ability for increasing the diameter of a hole as compared with themultilayer body 27. - It is noted that when the amount of gap between adjacent windings of the
wire 24 a is configured so as to be gradually reduced toward the proximal end side, the following effect can be observed: the stiffness of the dilator 70 (the multilayer body 77) along the axis direction can be gradually changed so that the dilator 70 (the multilayer body 77) can easily enter into the inside of an approach pathway even when the approach pathway meanders. -
FIG. 13 shows an overall view of a dilator according to the disclosed embodiments. - In
FIG. 13 , the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon. - In
FIG. 13 , adilator 80 includes ashaft 81, a spirally-arranged protrudingportion 82, and aconnector 9 connected to a proximal end of theshaft 81. - The
shaft 81 has a hollow shape in which aninner cavity 81 a is formed extending penetratingly from the proximal end to a distal end of theshaft 81. Theshaft 81 also has abody portion 83, a taperedportion 84, and a distal-end portion 85. - There is no particular limitation for the materials of the
shaft 81 and the spirally-arranged protrudingportion 82 as long as they can ensure the flexibility of the taperedportion 84 and the distal-end portion 85 and have biocompatibility. For example, the following materials can be used: stainless steel; superelastic alloy materials such as nickel-titanium alloys; or synthetic resins such as polyvinyl chloride resin, urethane resin, polyolefin resin, polyamide resin, and fluororesin. - The
body portion 83 is located at the proximal end side of thedilator 80, and theconnector 9 is connected to a proximal end thereof. Further, thebody portion 83 has a substantially constant outer diameter from the proximal end thereof through the distal end. - The tapered
portion 84 is connected to the distal end of thebody portion 83, extends from that distal end to the distal end side, and has a shape tapered toward the distal end side. That is, the taperedportion 84 is configured such that the outer diameter of the distal end side thereof is smaller than that of the proximal end side and corresponds to a portion having an outer diameter increasing toward the proximal end side from the distal end side of theshaft 81. - The distal-
end portion 85 is connected to the distal end of the taperedportion 84 and extends from that distal end to the distal end side. Further, the distal-end portion 85 has a substantially constant outer diameter from the proximal end to the distal end thereof. As described above, theshaft 81 has a hollow shape having an outer diameter that is smaller at the distal end than at the proximal end. - The spirally-arranged protruding
portion 82 is provided on an outerperipheral surface 81B of theshaft 81 so as to be protruding outwardly (from the outermost surface of thedilator 80, the outermost portion). The spirally-arranged protrudingportion 82 is provided at a distal-end side portion of thebody portion 83, at the taperedportion 84, and at the distal-end portion 85 and has gaps between adjacent portions along an axis A of theshaft 81. That is, the adjacent portions of the spirally-arranged protrudingportion 82 are spaced from each other. The gaps are configured so as to be gradually smaller toward the proximal end side from the distal end side of theshaft 81. The spirally-arranged protrudingportion 82 is integrally formed with theshaft 81 by casting or the like. - In the
dilator 80, the spirally-arranged protrudingportion 82 protruding outwardly is provided on the outerperipheral surface 81B of theshaft 81 and has gaps between adjacent portions along the axis A of theshaft 81. This configuration enables the dilator to be advanced not only by a conventional pushing operation but also by a rotational operation of the spirally-arranged protrudingportion 82. - Further, the spirally-arranged protruding
portion 82 provided at a portion having an outer diameter increasing toward the proximal end side from the distal end side of the shaft, that is, at the taperedportion 84, can easily increase the diameter of a pre-formed hole. - Further, the gaps of the spirally-arranged protruding
portions 82 configured so as to be gradually smaller toward the proximal end side from the distal end side of theshaft 81 can gradually change the stiffness of theshaft 81 along the axis direction. This can ensure the flexibility of the distal end of theshaft 81 and can maintain the pushability and torquability of theshaft 81 even when theshaft 81 is longer and curved. -
FIG. 14 shows a partial cross-sectional view of a distal-end side portion of a dilator according to the disclosed embodiments. - In
FIG. 14 , the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon. - In
FIG. 14 , a dilator 90 includes a shaft 91, a spirally-arranged protrudingportion 92, and a connector 9 (not shown) connected to a proximal end of the shaft 91. The material(s) of the shaft 91 and the spirally-arranged protrudingportion 92 is/are the same as that/those of theshaft 81 and the spirally-arranged protrudingportion 82 of thedilator 80. - The shaft 91 has a hollow shape in which an
inner cavity 91 a is formed extending penetratingly from the proximal end to a distal end of the shaft 91. Further, the shaft 91 has abody portion 93 and a taperedportion 94. The dilator 90 differs from thedilator 80 in that the dilator 90 does not have a distal-end portion. - The
body portion 93 and the taperedportion 94 have the same configurations as thebody portion 83 and the taperedportion 84 of thedilator 80. Further, the spirally-arranged protrudingportion 92 is provided on an outerperipheral surface 91B of the shaft 91 so as to be protruding outwardly (the outermost surface of the dilator 90, the outermost portion). The spirally-arranged protrudingportion 92 is provided at a distal-end side portion of thebody portion 93 and at the taperedportion 94 and has gaps between adjacent portions along an axis A of the shaft 91. That is, the adjacent portions of the spirally-arranged protrudingportion 92 are spaced from each other. The gaps are configured so as to be gradually smaller toward the proximal end side from the distal end side of the shaft 91. The spirally-arranged protrudingportion 92 is integrally formed with the shaft 91 by casting or the like. In the dilator 90, the spirally-arranged protrudingportion 92 protruding outwardly is provided on the outerperipheral surface 91B of the shaft 91 and has gaps between adjacent portions along the axis A of the shaft 91 as described above. The spirally-arranged protrudingportion 92 is provided at a portion having an outer diameter increasing from the distal end side to the proximal end side of the shaft, i.e., at the taperedportion 94. The gaps of the spirally-arranged protrudingportions 92 are configured so as to be gradually smaller toward the proximal end side from the distal end side of the shaft 91. Therefore, the dilator 90 can produce similar effects as thedilator 80. -
FIG. 15 shows a partial cross-sectional view of a distal-end side portion of a dilator according to the disclosed embodiments. - In
FIG. 15 , the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon. - In
FIG. 15 , adilator 100 includes ashaft 101, a spirally-arranged protrudingportion 102, and a connector 9 (not shown) connected to a proximal end of theshaft 101. The material(s) of theshaft 101 and the spirally-arranged protrudingportion 102 is/are the same as that/those of theshaft 81 and the spirally-arranged protrudingportion 82 of thedilator 80. - The
shaft 101 has a hollow shape in which aninner cavity 101 a is formed extending penetratingly from a proximal end to a distal end. Further, theshaft 101 has a taperedportion 104. Thedilator 100 differs from thedilator 80 in that thedilator 100 does not have either a distal-end portion or a body portion. That is, theshaft 101 has a tapered shape having an outer diameter gradually decreasing from a proximal end to a distal end throughout its entire length. This means that theshaft 101 has a hollow shape having an outer diameter that is smaller at the distal end than at the proximal end. - The spirally-arranged protruding
portion 102 is provided on an outerperipheral surface 101B of theshaft 101 so as to be protruding outwardly (the outermost surface of thedilator 100, the outermost portion). The spirally-arranged protrudingportion 102 is provided at a distal-end side portion of the taperedportion 104 and has gaps between adjacent portions along an axis A of theshaft 101. That is, the adjacent portions of the spirally-arranged protrudingportion 102 are spaced from each other. The gaps are configured so as to be gradually smaller toward the proximal end side from the distal end side of theshaft 101. The spirally-arranged protrudingportion 102 is integrally formed with theshaft 101 by casting or the like. - In the
dilator 100, the spirally-arranged protrudingportion 102 protruding outwardly is provided on the outerperipheral surface 101B of theshaft 101 and has gaps between adjacent portions along the axis A of theshaft 101 as described above. The spirally-arranged protrudingportion 102 is provided at the taperedportion 104 which corresponds to a portion having an outer diameter increasing toward the proximal end side from the distal end side of the shaft. The gaps of the spirally-arranged protrudingportions 102 are configured so as to be gradually smaller toward the proximal end side from the distal end side of theshaft 101. Therefore, thedilator 100 can produce similar effects as thedilator 80. -
FIG. 16 shows a partial cross-sectional view of a distal-end side portion of a dilator according to the disclosed embodiments. - In
FIG. 16 , the left side in the figure corresponds to the front end side (the distal side) which is to be inserted into the body, and the right side corresponds to the base end side (the hand side, the proximal side) which is to be operated by an operator such as a surgeon. - In
FIG. 16 , adilator 110 includes ashaft 111, a spirally-arranged protrudingportion 112, and a connector 9 (not shown) connected to a proximal end of theshaft 111. The material(s) of theshaft 111 and the spirally-arranged protrudingportion 112 is/are the same as that/those of theshaft 81 and the spirally-arranged protrudingportion 82 of thedilator 80. - The
shaft 111 has a hollow shape in which aninner cavity 111 a is formed extending penetratingly from the proximal end to a distal end of theshaft 111. Further, theshaft 111 has abody portion 113 and a distal-end portion 115. - The
body portion 113 is located at the proximal end side of thedilator 110, and theconnector 9 is connected to a proximal end thereof. Further, thebody portion 113 has a substantially constant outer diameter from the proximal end to the distal end thereof. - The distal-
end portion 115 is connected to the distal end of thebody portion 113 and extends from that distal end to the distal end side. Further, the distal-end portion 115 has a substantially constant outer diameter from the proximal end to the distal end thereof. The outer diameter of the distal-end portion 115 is smaller than that of thebody portion 113, and the distal-end portion 115 is formed coaxially with thebody portion 113. This means that theshaft 111 has a hollow shape having an outer diameter that is smaller at a distal end than at a proximal end. Further, thebody portion 113 corresponds to a portion having an outer diameter increasing from the distal end side to the proximal end side of theshaft 111. - The spirally-arranged protruding
portion 112 is provided on an outerperipheral surface 111B of theshaft 111 so as to be protruding outwardly (the outermost surface of thedilator 110, the outermost portion). The spirally-arranged protrudingportion 112 is provided at a distal-end side portion of thebody portion 113 and at thedistal end portion 115 and has gaps between adjacent portions along an axis A of theshaft 111. That is, the adjacent portions of the spirally-arranged protrudingportion 112 are spaced from each other. The gaps are configured so as to be gradually smaller toward the proximal end side from the distal end side of theshaft 111. The spirally-arranged protrudingportion 112 is integrally formed with theshaft 111 by casting or the like. - In the
dilator 110, the spirally-arranged protrudingportion 112 protruding outwardly is provided on the outerperipheral surface 111B of theshaft 111 and has gaps between adjacent portions along the axis A of theshaft 111. This configuration enables the dilator to be advanced not only by a conventional pushing operation but also by a rotational operation of the spirally-arranged protrudingportion 112. - Further, the spirally-arranged protruding
portion 112 is provided at a portion having an outer diameter increasing toward the proximal end side from the distal end side of the shaft, that is, at thebody portion 113. This configuration enables the diameter of a pre-formed hole to be easily increased. - Further, the gaps of the spirally-arranged protruding
portions 112 configured so as to be gradually smaller toward the proximal end side from the distal end side of theshaft 111 can gradually change the stiffness of theshaft 111 at the axis A. This can ensure the flexibility of the distal end of theshaft 111 and can maintain the pushability and torquability of theshaft 111 even when theshaft 111 is longer and curved. - Hereinbefore, the embodiments of the present disclosure are described, but the present disclosure shall not be limited to these embodiments. Rather, various modifications may be made.
- For example, the
hollow coil body 3, thehollow coil body 21, thehollow coil body 31, thehollow coil body 41, thehollow coil body 51, and thehollow coil body 61 are described as hollow coil bodies including 10 wires in the aforementioned embodiments, but the number of wires shall not be limited to 10. The number may be one or more. - Further, the
coil body 22, thecoil body 42, thecoil body 52, and thecoil body 62 are described as coil bodies including 16 wires in the aforementioned embodiments, but the number of wires shall not be limited to 16. The number may be one or more. - Moreover, the
coil body 23 and thecoil body 33 are described as coil bodies including 23 wires in the aforementioned embodiments, but the number of wires shall not be limited to 23. The number may be one or more. - Moreover, the distal-end portion 6 is described to be formed by casting a solder material into the distal end of the
multilayer body 17. However, the outer periphery of thecoil body 5 and/or thecoil body 3 in the vicinity of the distal-end portion of themultilayer body 17 may be sanded to form the distal-end portion 6 having a flat surface. This also applies to the distal-end portion 66. - Furthermore, the distal-end portion 6 is described as being fixed to the distal end of the
multilayer body 17. However, similar effects may be produced by fixing a distal-end portion to the distal end of themultilayer body 27, the distal end of themultilayer body 37, the distal end of themultilayer body 47, the distal end of themultilayer body 77, the distal end of theshaft 81, the distal end of the shaft 91, the distal end of theshaft 101, or the distal end of theshaft 111. - Further, the outer peripheries of the
multilayer bodies shafts portions shaft 81 and the spirally-arranged protrudingportion 82 of thedilator 80 may be coated with aresin 86 as shown inFIG. 17 . Theresin 86 can improve slidability to prevent damage to living body tissue. When the outer periphery of theshaft 81 is coated with theresin 86, a portion where thebody portion 83, the taperedportion 84, and the distal-end portion 85 are coated with theresin 86 corresponds to theshaft 81, and a portion protruding outwardly from the outerperipheral surface 81B of theshaft 81 corresponds to the spirally-arranged protrudingportion 82. Examples of theresin 86 include, for example, biocompatible resin materials such as polyamide resin and fluororesin, or hydrophilic coating materials. Theresin 86 may have a thickness of, for example, 0.1 μm to 300 μm. - Further, the spirally-arranged protruding
portions shaft 81. However, the gaps may be evenly spaced. Moreover, theshafts spiral protruding portions - The shaft may have various types of coating on the side of the surface thereof (including a portion between the shaft and the spirally-arranged protruding portion) other than or in addition to the
resin 86 shown inFIG. 17 . Examples of the coating include, for example, a protective film on the surface of the shaft (representative example: a plating film), an underlying film for improving adhesiveness between the shaft and the spirally-arranged protruding portion, and the like. - Preferably, the spirally-arranged protruding portions are not configured to serve as a blade. The dilators are intended for expanding a hole pre-formed on a target object (for example, the wall of a digestive tract such as the patient's stomach). Therefore, if the spirally-arranged protruding portion serves as a blade, living tissue at the inner surface of the hole may be damaged.
- For this reason, the spirally-arranged protruding portion preferably does not have a sharp edge at an end portion at a radially outer side of the shaft in a cross-section (for example, a cross-section perpendicular to the spiral direction of the spirally-arranged protruding
portion 82 as shown inFIG. 13 ). That is, the above end portion preferably has an area having a shape including an obtuse angle or a curve (for example, a curve constituting a part of a circle or an ellipse). Thus, the spirally-arranged protruding portion is configured so as not to cut living tissue when dilating a hole pre-formed on a target object.
Claims (18)
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US11331459B2 (en) * | 2017-03-24 | 2022-05-17 | Asahi Intecc Co., Ltd. | Dilator |
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WO2019215827A1 (en) * | 2018-05-09 | 2019-11-14 | 朝日インテック株式会社 | Medical-use tube |
JP7457579B2 (en) * | 2020-06-01 | 2024-03-28 | 朝日インテック株式会社 | dilator |
WO2021255906A1 (en) * | 2020-06-18 | 2021-12-23 | 朝日インテック株式会社 | Support device |
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WO2023112192A1 (en) * | 2021-12-15 | 2023-06-22 | 朝日インテック株式会社 | Dilator |
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US11331459B2 (en) * | 2017-03-24 | 2022-05-17 | Asahi Intecc Co., Ltd. | Dilator |
US11389631B2 (en) | 2017-03-24 | 2022-07-19 | Asahi Intecc Co., Ltd. | Dilator |
US11819647B2 (en) | 2017-03-24 | 2023-11-21 | Asahi Intecc Co., Ltd. | Dilator |
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